Normal Distributions

Question 1

In a binomial experiment, if there are two possible outcomes and P(S) = 0.36, what is P(F)?

Revolt · Accepted Answer

D: 0.64

Question 2

Suppose the heights of adult men are normally distributed. The heights of a sample of
30 men are shown below, in inches.65, 83, 69, 67, 69, 67, 67, 72, 85, 68, 73, 65, 67
,65, 72, 71, 67, 73, 68, 72, 61, 75, 66, 78, 65, 71, 68, 76, 67, 68.What is the mean
and standard deviation of this sample?a.mean: 70standard
deviation:  4.626c.mean: 70standard
deviation:  5.228b.mean:
67standard deviation: 
4.626d.mean:
67standard deviation: 
5.228

Revolt · Accepted Answer

C: C

Question 3

Which of the following represents the probability of 3 successes in 5 trials?

Revolt · Accepted Answer

B: 5C3P(S)3P(F)2

Question 4

Suppose that, without even reading the questions, you guess on all four questions of a true-or-false test. Compare the quantity in Column A with the quantity in Column B. Choose the best answer.

Question 5

A set of data is normally distributed with a mean of 64 and a standard deviation of 2.5. What percent of the data is in the interval 64-66.5?

Revolt · Accepted Answer

34%

Question 6

Suppose that you ask three friends to go to the mall. Each one has a 0.80 chance of saying yes. What is the probability that all three friends will say they can go to the mall with you?

Revolt · Accepted Answer

C: 0.512

Question 7

The
life expectancy (in hours) of a fluorescent tube is normally distributed with a mean 8000 and a
standard deviation 1000. Find the probability that a tube lasts for more than 11000
hours.

Revolt · Accepted Answer

0.0015

Question 8

Four
students took a national standardized test for which the mean was 500 and the standard deviation was
100. If a student’s z-value was 1.75 on the test, what was the student’s
score?a.675c.645b.650d.700

Revolt · Accepted Answer

A: A

Question 9

A set
of data is normally distributed with a mean of 40 and a standard deviation of 2. What percent of the
data is in the interval 38-42?

Revolt · Accepted Answer

68.3%

Question 10

The
heights of 500 students at a local school were recorded and found to be approximated by the normal
curve below. Which answer could represent the mean and standard deviation for these
data?a.69,
6c.69, 
3b.72,
4d.60,
3

Revolt · Accepted Answer

C: C

Normal Distributions Answers

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