Question 15.

A certain survey in the US found that half the nation's teens between the ages of 15 and 17 have jobs at some time during the year; 67% of adults say that it is a good idea for teens to hold a part-time job while in school, even if they don't need the money.

(a)What is the probability that exactly two of the next three randomly selected adults say it's a good idea for teens to hold a part-time job while in school, even if they don't need the money?

(b)What is the probability that 8 of the next 12 randomly selected adults say it's a good idea for teens to hold a part-time job while in school, even if they don't need the money?

(c)What is the probability that exactly 20 of the next 30 randomly selected adults say it's a good idea for teens to hold a part-time job while in school, even if they don't need the money?

Question 16.

It was found that 45% of Americans know somebody who became addicted to a drug other than alcohol. If we assume this to be true what are the probabilities of:

(a)Exactly three of a random sample of five know someone who became addicted.

(b)Exactly 7 of a random sample of 15 know someone who became addicted

(c)At least 7 of a random sample of 15 know someone who became addicted

(d)No more than 7 of a random sample of 15 know someone who became addicted.

Question 17.

If 20% of the people in a community use the emergency room at a hospital in one year, find these probabilities for a sample of 10 people:

(a)At most three used the emergency room.

(b)Exactly three used the emergency room.

(c)At least five used the emergency room.

Question 18

If 10% of the people who are given a certain drug experience dizziness, find these probabilities for a sample of 15 people who take the drug:

(a)At least two people will become dizzy.

(b)Exactly three people will become dizzy.

(c)At most four people will become dizzy.