A Poll showed that 25% of Americans are satisfied with the way things are going

ID: 3376745 • Letter: A

Question

A Poll showed that 25% of Americans are satisfied with the way things are going in the

United States. Suppose a sample of 15 Americans is selected as part of a study of the state of the

nation.

a) Compute the probability that exactly 5 of the 15 Americans surveyed are satisfied with the way

things are going in the United States.

b) Compute the probability that at least 3 of the Americans surveyed are satisfied with the way things

are going in the United States.

c) Compute the probability that no more than 4 of the Americans surveyed are satisfied with the way

things are going in the United States.

d) Compute the probability that more than 2 but less than 6 of the Americans surveyed are satisfied

with the way things are going in the United States.

e) Compute the expected value, variance, and standard deviation of the number of Americans who

are satisfied with the way things are going in the United States.

A Poll showed that 25% of Americans are satisfied with the way things are going

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