# Week 3 test.docx - Week 3 Test Return to Assessment List...

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Week 3 TestReturn to Assessment ListPart 1 of 6 - Binomial Distribution5.0/ 5.0 PointsQuestion 1 of 201.0/ 1.0 PointsIt was found that 60% of people have a dog as a pet. If a random sample of 11 people is selected,what is the variance of the number of people that have a dog as a pet? (That is, what is Var(X)?) (round to 2 decimal places) Answer: 2.64
Question 2 of 201.0/ 1.0 PointsA coin is flipped 30 times. What is the probability of getting 15 or more heads? Round answer to 4 decimal places. Answer: 0.5722
Question 3 of 201.0/ 1.0 PointsIt is known that 50% of adult workers have a high school diploma. If a random sample of 8 adult workers is selected, what is the probability that less than 6 of them have a high school diploma? (That is, what is P(X < 6) (round to 4 decimal places) Answer: 0.8555
Question 4 of 20
1.0/ 1.0 PointsA coin is flipped 30 times. What is the probability of getting exactly 15 heads? Round answer to 4 decimal places. Answer: 0.1445
Question 5 of 201.0/ 1.0 PointsIf random variable X has a binomial distribution with n =8 and P(success) = p =0.5, find the probability that X is at most 3. (That is, find P(X ≤ 3)) (round to 4 decimal places) Answer:
Feedback:In Excel,=BINOM.DIST(3,8,0.5,TRUE)Part 2 of 6 - Contingency Tables0.0/ 1.0 Points
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