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**About Probability Theory: Foundation for Data Science Course**

Learn the principles underlying probability and how it relates to statistics and data analytics. We’ll discover the definition of probability calculation, independent and dependent outcomes, and conditional occurrences. We’ll investigate discrete and continuous random variables to discover how data collecting fits in. The Central Limit Theorem and Gaussian (normal) random variables will be the course’s final topics, and we will comprehend its critical significance for all of statistics and data science.

As a component of the Master of Science in Data Science (MS-DS) degree offered by CU Boulder on the Coursera platform, this course can be taken for academic credit. The MS-DS is a multidisciplinary degree that brings together academics from Applied Mathematics, Computer Science, Information Science, and other departments at CU Boulder. The MS-DS is best suited for people with a wide range of undergraduate education and/or professional experience in computer science, information science, mathematics, and statistics because it has performance-based admissions and no application process. Visit *https://www.coursera.org/degrees/master-of-science-data-science-boulder* to learn more about the MS-DS program.

Christopher Burns’ Unsplash shot was used as inspiration for the logo.

**WHAT YOU WILL LEARN**

- Explain why probability is important to statistics and data science.
- See the relationship between conditional and independent events in a statistical experiment.
- Calculate the expectation and variance of several random variables and develop some intuition.

**SKILLS YOU WILL GAIN**

- Probability
- central limit theorem
- continuous random variables
- Bayes’ Theorem
- discrete random variables

**Course Apply Link – Probability Theory: Foundation for Data Science **

**Probability Theory: Foundation for Data Science Quiz Answers**

### Week 1 Quiz Answers

#### Quiz 1: Module 1 Quiz

Q1. Prompt 1: For each of the following scenarios, find the requested probability. Assume the sets AA, BB, and CC are events from the same sample space SS. (Hint: Venn diagrams may help with the visualization, although they are not required to answer the questions.)

If P(A) = .4P(A)=.4, P(B^c) = .7P(B

c

)=.7, and P(A โฉ B^c) = .2P(AโฉB

c

)=.2, find P(A โฉ B)P(AโฉB)

Enter answer here

Q2. Prompt 1: For each of the following scenarios, find the requested probability. Assume the sets AA, BB, and CC are events from the same sample space SS. (Hint: Venn diagrams may help with the visualization, although they are not required to answer the questions.)

If P(A) = 0.9P(A)=0.9 and P(B) = 0.9P(B)=0.9, what is the lower bound for P(A \cup B)P(AโชB).

Enter answer here

Q3. Prompt 2: Three popular options on a certain type of car are AA leather seats, BB a sunroof, and CC heated seats. In the past, P(A) = 0.55P(A)=0.55 (i.e. 55% of the customers have requested option A), P(B) = 0.45P(B)=0.45, P(C) = 0.4P(C)=0.4. Furthermore, P(A โฉ B) = 0.25P(AโฉB)=0.25, P(A โฉ C) = 0.2P(AโฉC)=0.2, P(B โฉ C) = 0.15P(BโฉC)=0.15 and P(A โฉ B โฉ C) = 0.1P(AโฉBโฉC)=0.1.

Find the probability that a customer will ask for at least one of the three options.

Enter answer here

Q4. Prompt 2: Three popular options on a certain type of car are AA leather seats, BB a sunroof, and CC heated seats. In the past, P(A) = 0.55P(A)=0.55 (i.e. 55% of the customers have requested option A), P(B) = 0.45P(B)=0.45, P(C) = 0.4P(C)=0.4. Furthermore, P(A โฉ B) = 0.25P(AโฉB)=0.25, P(A โฉ C) = 0.2P(AโฉC)=0.2, P(B โฉ C) = 0.15P(BโฉC)=0.15 and P(A โฉ B โฉ C) = 0.1P(AโฉBโฉC)=0.1.

Find the probability that a customer will not ask for any of these three options.

Enter answer here

Q5. Prompt 2: Three popular options on a certain type of car are AA leather seats, BB a sunroof, and CC heated seats. In the past, P(A) = 0.55P(A)=0.55 (i.e. 55% of the customers have requested option A), P(B) = 0.45P(B)=0.45, P(C) = 0.4P(C)=0.4. Furthermore, P(A โฉ B) = 0.25P(AโฉB)=0.25, P(A โฉ C) = 0.2P(AโฉC)=0.2, P(B โฉ C) = 0.15P(BโฉC)=0.15 and P(A โฉ B โฉ C) = 0.1P(AโฉBโฉC)=0.1.

Find the probability that a customer will ask for heated leather seats but not a sunroof.

Enter answer here

Q6. Prompt 2: Three popular options on a certain type of car are AA leather seats, BB a sunroof, and CC heated seats. In the past, P(A) = 0.55P(A)=0.55 (i.e. 55% of the customers have requested option A), P(B) = 0.45P(B)=0.45, P(C) = 0.4P(C)=0.4. Furthermore, P(A โฉ B) = 0.25P(AโฉB)=0.25, P(A โฉ C) = 0.2P(AโฉC)=0.2, P(B โฉ C) = 0.15P(BโฉC)=0.15 and P(A โฉ B โฉ C) = 0.1P(AโฉBโฉC)=0.1.

Find the probability that a customer will ask for at most two of the options.

Enter answer here

Q7. Prompt 2: Three popular options on a certain type of car are AA leather seats, BB a sunroof, and CC heated seats. In the past, P(A) = 0.55P(A)=0.55 (i.e. 55% of the customers have requested option A), P(B) = 0.45P(B)=0.45, P(C) = 0.4P(C)=0.4. Furthermore, P(A โฉ B) = 0.25P(AโฉB)=0.25, P(A โฉ C) = 0.2P(AโฉC)=0.2, P(B โฉ C) = 0.15P(BโฉC)=0.15 and P(A โฉ B โฉ C) = 0.1P(AโฉBโฉC)=0.1.

Find the probability that a customer will ask for exactly two of the options.

Enter answer here

Q8. Prompt 3: A message of length 5 digits is to be sent. Each digit can be a 0, 1, or 2.

What is the cardinality of the sample space?

Enter answer here

Q9. Prompt 3: A message of length 5 digits is to be sent. Each digit can be a 0, 1, or 2.

If every message is equally likely, what is the probability that the message consists of 2 zeros, 2 ones, and 1 two? Round your answer to have four decimal places.

Enter answer here

Q10. Prompt 3: A message of length 5 digits is to be sent. Each digit can be a 0, 1, or 2.

What is the probability that the message contains at least one zero? Round your answer to have three decimal places.

Enter answer here

### Week 2 Quiz Answers

#### Quiz 1: Module 2 Quiz

Q1. Prompt 1: For each of the following scenarios, answer the question with a numerical answer or a โYesโ or โNoโ. If you do not have enough information, write โCanโt tellโ. For all situations, assume 0 < P(A) < 10<P(A)<1 and 0 < P(B) < 10<P(B)<1.

If AA and BB are two events such that P(A) = 0.7P(A)=0.7, P(B) = 0.5P(B)=0.5, and P(B|A) = 0.6P(BโฃA)=0.6, find P(A โช B)P(AโชB). If possible, round your answer to two decimal places.

Enter answer here

Q2. Prompt 1: For each of the following scenarios, answer the question with a numerical answer or a โYesโ or โNoโ. If you do not have enough information, write โCanโt tellโ. For all situations, assume 0 < P(A) < 10<P(A)<1 and 0 < P(B) < 10<P(B)<1.

If AA is a subset of BB, can AA and BB be independent? (Answer Yes, No, or Canโt tell.)

Enter answer here

Q3. Prompt 1: For each of the following scenarios, answer the question with a numerical answer or a โYesโ or โNoโ. If you do not have enough information, write โCanโt tellโ. For all situations, assume 0 < P(A) < 10<P(A)<1 and 0 < P(B) < 10<P(B)<1.

If A is a subset of B, calculate P(B|A), if you can. (If you canโt, answer Canโt tell.)

Enter answer here

Q4. Prompt 1: For each of the following scenarios, answer the question with a numerical answer or a โYesโ or โNoโ. If you do not have enough information, write โCanโt tellโ. For all situations, assume 0 < P(A) < 10<P(A)<1 and 0 < P(B) < 10<P(B)<1.

If A is a subset of B, calculate P(A|B), if you can. (If you canโt, answer Canโt tell.)

Enter answer here

Q5. Prompt 1: For each of the following scenarios, answer the question with a numerical answer or a โYesโ or โNoโ. If you do not have enough information, write โCanโt tellโ. For all situations, assume 0 < P(A) < 10<P(A)<1 and 0 < P(B) < 10<P(B)<1.

If P(A) = 0.8, P(B|A) = 0.5 and A and B are dependent (not independent), then is P(B) โค P(A)? (Answer Yes, No, or Canโt tell)

Enter answer here

Q6. Prompt 2: An unfair coin is flipped four times. The probability of a heads is 0.6 and the probability of a tails is 0.4. Every flip is independent of every other flip.

Find the probability of getting exactly 2 heads and 2 tails. Round your answer to four decimal places.

Enter answer here

Q7. Prompt 2: An unfair coin is flipped four times. The probability of a heads is 0.6 and the probability of a tails is 0.4. Every flip is independent of every other flip.

Find the probability of getting exactly 2 heads and 2 tails given that the first coin flip was a head. Round your answer to three decimal places.

Enter answer here

Q8. Prompt 3: 70\%70% of the light aircraft that disappear while in flight in a certain country are subsequently found. Of the aircraft that are found, 60\%60% have an emergency locator, whereas only 10\%10% of the aircraft not found have such a locator. Suppose a light aircraft has disappeared.

If the aircraft has an emergency locator, what is the probability that it will not be found? Round your answer to three decimal places.

Enter answer here

Q9. Prompt 3: 70\%70% of the light aircraft that disappear while in flight in a certain country are subsequently found. Of the aircraft that are found, 60\%60% have an emergency locator, whereas only 10\%10% of the aircraft not found have such a locator. Suppose a light aircraft has disappeared.

Are the two events L=L=the plane has a locator and F=F=the plane is found independent?

- Yes
- No

### Week 3 Quiz Answers

#### Quiz 1: Module 3 Quiz

Q1. **Prompt 1:** A critical system has 55 different components, each of which works with probability 0.900.90. Assume each component works independently of the others. Let X*X* be the number of components that are working.

Find P(X = 2)*P*(*X*=2). Round your answer to four decimal places.

Q2. **Prompt 1:** A critical system has 55 different components, each of which works with probability 0.900.90. Assume each component works independently of the others. Let X*X* be the number of components that are working.

Find E(X)*E*(*X*).

Q3. **Prompt 1:** A critical system has 55 different components, each of which works with probability 0.900.90. Assume each component works independently of the others. Let X*X* be the number of components that are working.

Find V(X)*V*(*X*). Round your answer to two decimal places.

Q4. **Prompt 2:** A certain type of item produced by a factory has a 6\%6% chance of being defective. Draw a random sample until you get the first defective. Let X*X* be the number of items that are drawn.

Find P(X = 2)*P*(*X*=2). Round your answer to four decimal places.

Q5. **Prompt 2:** A certain type of item produced by a factory has a 6\%6% chance of being defective. Draw a random sample until you get the first defective. Let X*X* be the number of items that are drawn.

Find E(X)*E*(*X*). Round answer to two decimal places.

Q6. **Prompt 2:** A certain type of item produced by a factory has a 6\%6% chance of being defective. Draw a random sample until you get the first defective. Let X*X* be the number of items that are drawn.

Find V(X)*V*(*X*). Round answer to two decimal places.

Q7. **Prompt 3:** A certain system can experience three different types of defects. Let A_i*Ai*โ, i = 1, 2, 3 be the event that the system has a defect of type i*i*. Suppose that P(A_1) = 0.17*P*(*A*1โ)=0.17, P(A_2) = 0.07*P*(*A*2โ)=0.07, P(A_3) = 0.13*P*(*A*3โ)=0.13, P(A_1 โช A_2) =0.18*P*(*A*1โโช*A*2โ)=0.18, P(A_2 โช A_3) = 0.18*P*(*A*2โโช*A*3โ)=0.18, P(A_1 โช A_3) = 0.19*P*(*A*1โโช*A*3โ)=0.19, and P(A_1 โฉ A_2 โฉ A_3) = 0.01*P*(*A*1โโฉ*A*2โโฉ*A*3โ)=0.01. Let the random variable X*X* be the number of defects that are present. Calculate P(X=0)*P*(*X*=0).

Q8. **Prompt 3:** A certain system can experience three different types of defects. Let A_i*A**i*โ, i = 1, 2, 3*i*=1,2,3 be the event that the system has a defect of type i*i*. Suppose that P(A_1) = 0.17*P*(*A*1โ)=0.17, P(A_2) = 0.07*P*(*A*2โ)=0.07, P(A_3) = 0.13*P*(*A*3โ)=0.13, P(A_1 โช A_2) =0.18*P*(*A*1โโช*A*2โ)=0.18, P(A_2 โช A_3) = 0.18*P*(*A*2โโช*A*3โ)=0.18, P(A_1 โช A_3) = 0.19*P*(*A*1โโช*A*3โ)=0.19, and P(A_1 โฉ A_2 โฉ A_3) = 0.01*P*(*A*1โโฉ*A*2โโฉ*A*3โ)=0.01. Let the random variable X*X* be the number of defects that are present.

Calculate P(X=1)*P*(*X*=1).

Q9. **Prompt 3:** A certain system can experience three different types of defects. Let A_i*A**i*โ, i = 1, 2, 3 be the event that the system has a defect of type i. Suppose that P(A_1) = .17*P*(*A*1โ)=.17, P(A_2) = 0.07*P*(*A*2โ)=0.07, P(A_3) = 0.13*P*(*A*3โ)=0.13, P(A_1 โช A_2) =0.18*P*(*A*1โโช*A*2โ)=0.18, P(A_2 โช A_3) = 0.18*P*(*A*2โโช*A*3โ)=0.18, P(A_1 โช A_3) = 0.19*P*(*A*1โโช*A*3โ)=0.19, and P(A_1 โฉ A_2 โฉ A_3) = .01*P*(*A*1โโฉ*A*2โโฉ*A*3โ)=.01. Let the random variable X*X* be the number of defects that are present.

Calculate P(X=2)*P*(*X*=2)

Q10. **Prompt 3:** A certain system can experience three different types of defects. Let A_i*A**i*โ, i = 1, 2, 3*i*=1,2,3 be the event that the system has a defect of type i*i*. Suppose that P(A_1) = 0.17*P*(*A*1โ)=0.17, P(A_2) = 0.07*P*(*A*2โ)=0.07, P(A_3) = 0.13*P*(*A*3โ)=0.13, P(A_1 โช A_2) =0.18*P*(*A*1โโช*A*2โ)=0.18, P(A_2 โช A_3) = 0.18*P*(*A*2โโช*A*3โ)=0.18, P(A_1 โช A_3) = 0.19*P*(*A*1โโช*A*3โ)=0.19, and P(A_1 โฉ A_2 โฉ A_3) = 0.01*P*(*A*1โโฉ*A*2โโฉ*A*3โ)=0.01. Let the random variable X*X* be the number of defects that are present.

Calculate P(X=3)*P*(*X*=3)

Q11. **Prompt 3:** A certain system can experience three different types of defects. Let A_i*A**i*โ, i = 1, 2, 3 be the event that the system has a defect of type i. Suppose that P(A_1) = .17*P*(*A*1โ)=.17, P(A_2) = 0.07*P*(*A*2โ)=0.07, P(A_3) = 0.13*P*(*A*3โ)=0.13, P(A_1 โช A_2) =0.18*P*(*A*1โโช*A*2โ)=0.18, P(A_2 โช A_3) = 0.18*P*(*A*2โโช*A*3โ)=0.18, P(A_1 โช A_3) = 0.19*P*(*A*1โโช*A*3โ)=0.19, and P(A_1 โฉ A_2 โฉ A_3) = .01*P*(*A*1โโฉ*A*2โโฉ*A*3โ)=.01. Let the random variable X*X* be the number of defects that are present.

Find E(X)*E*(*X*)

**Q12. Prompt 3:** A certain system can experience three different types of defects. Let A_i*A**i*โ, i = 1, 2, 3 be the event that the system has a defect of type i. Suppose that P(A_1) = .17*P*(*A*1โ)=.17, P(A_2) = 0.07*P*(*A*2โ)=0.07, P(A_3) = 0.13*P*(*A*3โ)=0.13, P(A_1 โช A_2) =0.18*P*(*A*1โโช*A*2โ)=0.18, P(A_2 โช A_3) = 0.18*P*(*A*2โโช*A*3โ)=0.18, P(A_1 โช A_3) = 0.19*P*(*A*1โโช*A*3โ)=0.19, and P(A_1 โฉ A_2 โฉ A_3) = .01*P*(*A*1โโฉ*A*2โโฉ*A*3โ)=.01. Let the random variable X*X* be the number of defects that are present.

Find V (X)*V*(*X*). Give four decimal places for your answer.

**Q13. Prompt 3:** A certain system can experience three different types of defects. Let A_i*A**i*โ, i = 1, 2, 3 be the event that the system has a defect of type i. Suppose that P(A_1) = .17*P*(*A*1โ)=.17, P(A_2) = 0.07*P*(*A*2โ)=0.07, P(A_3) = 0.13*P*(*A*3โ)=0.13, P(A_1 โช A_2) =0.18*P*(*A*1โโช*A*2โ)=0.18, P(A_2 โช A_3) = 0.18*P*(*A*2โโช*A*3โ)=0.18, P(A_1 โช A_3) = 0.19*P*(*A*1โโช*A*3โ)=0.19, and P(A_1 โฉ A_2 โฉ A_3) = .01*P*(*A*1โโฉ*A*2โโฉ*A*3โ)=.01. Let the random variable X*X* be the number of defects that are present.

Find ฯ*ฯ*, the standard deviation of X*X*. Round your answer to three decimal places.

### Week 4 Quiz Answers

#### Quiz 1: Module 4 Quiz

Q1. **Prompt 1:** A skilled worked requires at least 1010 minutes, and no more than 2020 minutes, to complete a certain task. The completion time X*X* is a continuous random variable with density function f(x) = c/x^2*f*(*x*)=*c*/*x*2 for 10 โค x โค 2010โค*x*โค20 and f(x) = 0 *f*(*x*)=0 for all other values of x*x*.

What is the value of c*c*?

Q2. **Prompt 1:** A skilled worked requires at least 1010 minutes, and no more than 2020 minutes, to complete a certain task. The completion time X*X* is a continuous random variable with density function f(x) = c/x^2*f*(*x*)=*c*/*x*2 for 10 โค x โค 2010โค*x*โค20 and f(x) = 0 *f*(*x*)=0 for all other values of x*x*.

Find the probability that the worker completes the task in 15 minutes or less. Round your answer to three decimal places.

Q3. **Prompt 1:** A skilled worked requires at least 1010 minutes, and no more than 2020 minutes, to complete a certain task. The completion time X*X* is a continuous random variable with density function f(x) = c/x^2*f*(*x*)=*c*/*x*2 for 10 โค x โค 2010โค*x*โค20 and f(x) = 0 *f*(*x*)=0 for all other values of x*x*.

Find the expected time expected time for the worker to complete the task. Round your answer to three decimal places.

Q4. **Prompt 2:** The number of eggs laid on a tree leaf by an insect of a certain type is a Poisson random variable, X*X*, with parameter c*c*, where E(X) = c*E*(*X*)=*c*. However, such a random variable can only be observed if it is positive, since if it is 0, then we cannot know that such an insect was on the leaf. If we let Y*Y* denote the observed number of eggs, then P(Y = i) = P(X = i|X > 0)*P*(*Y*=*i*)=*P*(*X*=*i*โฃ*X*>0), where X*X* is Poisson with parameter c*c*.

Find E(Y )*E*(*Y*).

(Note 1: your answer will be a mathematical expression with c*c*. When you type in your answer, the preview box will display what the mathematical expression looks like.

Note 2: Coursera uses the capital letter โEโ to represent the mathematical constant โeโ equivalent to approximately 2.72.)

Preview will appear hereโฆ

**Q5. Prompt 3:** Suppose X*X* is a random variable X \sim N(12, 4)*X*โผ*N*(12,4).

Find the probability that X*X* is within 1.51.5 standard deviations of the mean. Round your answer to four decimal places.

Q6. **Prompt 3:** Suppose X*X* is a random variable X \sim N(12, 4)*X*โผ*N*(12,4).

Find k*k* such that P(X > k) = 0.10*P*(*X*>*k*)=0.10. Round your answer to two decimal places.

### Week 6 Quiz Answers

#### Quiz 1: Module 5 Quiz

**Q1. Prompt 1:** A store orders 1010 units of a certain item. For each unit sold, it makes \$10$10. For each item that remains unsold, it loses \$5$5. Let X*X* be the number of items sold in a week. If the store knows that X*X* is a discrete uniform random variable, with X*X* taking values \{0, 1, \dots , 10\}{0,1,โฆ,10}, find the expected profit.

**Q2. Prompt 2: **Suppose that the service time at a call center is exponentially distributed with the average call lasting 10 minutes. If 33 workers are each on a call, what is the probability that they have each completed their service in 1212 minutes? Assume that the length of each call is independent of every other call. Round answer to four decimal places.

y=1 | y = 4 | y = 16 | |
---|---|---|---|

x=1 | 0.20 | 0.25 | 0.05 |

x=5 | 0.10 | 0.15 | 0.25 |

Q3. **Prompt 3:** Suppose that X*X* and Y*Y* are random variables with the joint probability mass function above.

Find P(X = 1).*P*(*X*=1).

**Q4. Prompt 3:** Suppose that X*X* and Y*Y* are random variables with the joint probability mass function below.

y=1 | y = 4 | y = 16 | |
---|---|---|---|

x=1 | 0.20 | 0.25 | 0.05 |

x=5 | 0.10 | 0.15 | 0.25 |

Find P(X > Y)*P*(*X*>*Y*).

Q5. **Prompt 3:** Suppose that X*X* and Y*Y* are random variables with the joint probability mass function below.

y=1 | y = 4 | y = 16 | |
---|---|---|---|

x=1 | 0.20 | 0.25 | 0.05 |

x=5 | 0.10 | 0.15 | 0.25 |

Determine Cov(X, Y)*Cov*(*X*,*Y*).

**Q6. Prompt 3:** Suppose that X*X* and Y*Y* are random variables with the joint probability mass function below.

y=1 | y = 4 | y = 16 | |
---|---|---|---|

x=1 | 0.20 | 0.25 | 0.05 |

x=5 | 0.10 | 0.15 | 0.25 |

Find \rho*ฯ*, the correlation coefficient of X*X* and Y*Y*. Round answer to four decimal places.

Q7. **Prompt 3:** Suppose that X and Y are random variables with the joint probability mass function above.

y=1 | y = 4 | y = 16 | |
---|---|---|---|

x=1 | 0.20 | 0.25 | 0.05 |

x=5 | 0.10 | 0.15 | 0.25 |

Are X and Y independent? (Answer โYesโ, โNoโ, or โCanโt determineโ)

### Week 6 Quiz Answers

#### Quiz 1: Module 6 Quiz

Q1. **Prompt 1: **Suppose 3030 numbers are selected at random from the interval [0, 1][0,1]. That is, X_i \sim U[0, 1]*Xi*โโผ*U*[0,1] for i =1, 2, . . . 30*i*=1,2,โฆ30. Given \bar{X} = (1/30) \sum_{i=1}^{30} X_i *X*ห=(1/30)โ*i*=130โ*Xi*โ estimate P(0.5 \leq \bar{X} \leq 0.6)*P*(0.5โค*X*หโค0.6). (Round your answer to three decimal places.)

**Q2. Prompt 2:** A company wants to compare the efficiency of two types of fuel for a car. 55 identical cars will be driven 500500 kilometers each, two with the first type of fuel and three with the second type. Let X_1*X*1โ and X_2*X*2โ be the observed fuel efficiency for the first type and Y_1*Y*1โ, Y_2*Y*2โ, and Y_3*Y*3โ be the efficiency for the second type. Suppose these variables are independent and X_i \sim N(20, 4)*X**i*โโผ*N*(20,4) for i = 1, 2*i*=1,2 and Y_j \sim N(18, 9)*Y**j*โโผ*N*(18,9) for j=1, 2, 3*j*=1,2,3. Define a new random variable: W = (X_1 + X_2)/2 โ (Y_1 + Y_2 + Y_3)/3*W*=(*X*1โ+*X*2โ)/2โ(*Y*1โ+*Y*2โ+*Y*3โ)/3.

Find E(W)*E*(*W*).

Q3. **Prompt 2:** A company wants to compare the efficiency of two types of fuel for a car. 55 identical cars will be driven 500500 kilometers each, two with the first type of fuel and three with the second type. Let X_1*X*1โ and X_2*X*2โ be the observed fuel efficiency for the first type and Y_1*Y*1โ, Y_2*Y*2โ, and Y_3*Y*3โ be the efficiency for the second type. Suppose these variables are independent and X_i \sim N(20, 4)*X**i*โโผ*N*(20,4) for i = 1, 2*i*=1,2 and Y_j \sim N(18, 9)*Y**j*โโผ*N*(18,9) for j=1, 2, 3*j*=1,2,3. Define a new random variable: W = (X_1 + X_2)/2 โ (Y_1 + Y_2 + Y_3)/3*W*=(*X*1โ+*X*2โ)/2โ(*Y*1โ+*Y*2โ+*Y*3โ)/3.

Find Var(W)*Var*(*W*).

Q4. **Prompt 2:** A company wants to compare the efficiency of two types of fuel for a car. 55 identical cars will be driven 500500 kilometers each, two with the first type of fuel and three with the second type. Let X_1*X*1โ and X_2*X*2โ be the observed fuel efficiency for the first type and Y_1*Y*1โ, Y_2*Y*2โ, and Y_3*Y*3โ be the efficiency for the second type. Suppose these variables are independent and X_i \sim N(20, 4)*X**i*โโผ*N*(20,4) for i = 1, 2*i*=1,2 and Y_j \sim N(18, 9)*Y**j*โโผ*N*(18,9) for j=1, 2, 3*j*=1,2,3. Define a new random variable: W = (X_1 + X_2)/2 โ (Y_1 + Y_2 + Y_3)/3*W*=(*X*1โ+*X*2โ)/2โ(*Y*1โ+*Y*2โ+*Y*3โ)/3.

Find P(W โฅ 0). *P*(*W*โฅ0). Round answer to four decimal places.

**Conclusion**

Hopefully, this article will be useful for you to find all theย **Week, final assessment, and Peer Graded Assessment Answers of Probability Theory: Foundation for Data Science Quiz of Coursera**ย and grab some premium knowledge with less effort. If this article really helped you in any way then make sure to share it with your friends on social media and let them also know about this amazing training. You can also check out our other courseย Answers.ย So, be with us guys we will share a lot more free courses and their exam/quiz solutions also, and follow ourย Techno-RJย **Blog**ย for more updates.

It’s the best time to make a few plans for the long run and it’s time to be happy. I’ve learn this submit and if I could I wish to counsel you some interesting things or advice. Perhaps you can write next articles referring to this article. I want to learn more things about it!

My Week 1 quiz answers

1) 0.2

2) 0.9

3) 0.90

4) 0.1

5) 0.25

6) 0.9

7) 0.3

8) 243

9) 0.1235

10) 0.868

Week 2 Quiz

1) 0.78

2) No

3) 1

4) Can’t tell

5) Yes

6) ???

7) 0.288

8) 0.067

9) No

Week 3 quiz

1) 0.0081

2) 4.5

3) 0.45

4) 0.0564

5) 16.67

6) 261.11

7) 0.81

8) 0.02

9) 0.16

10) 0.01

11) 0.37

12) 0.6131

13) 0.783

Week 4 quiz

1) 20

2) 0.667

3) 13.863

4) ???

5) 0.8664

6) 14.56

Week 5 qz

1) 25

2) 0.3412

3) 0.50

4) 0.25

5) 5.40

6) 0.4345

7) No

Week 6 qz

1) 0.471

2) 2

3) 5

4) 0.8145

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