Discrete Probability Distributions

Chapter 7

(Discrete Probability Distributions): Exercise 7.97

7.97 In the United States, voters who are neither Democrat nor Republican are called Independent. It is believed that 10% of all voters are Independent. A survey asked 25 people to identify themselves as Democrat, Republican, or Independent.

a. What is the probability that none of the people are Independent?

b. What is the probability that fewer than five people are Independent?

c. What is the probability that more than two people are Independent?

Chapter 8

(Continuous Probability Distributions): Exercise 8.42

8.42. Travelbus is an Internet-based travel agency wherein customers can see videos of the cities they plan to visit. The number of hits daily is a normally distributed random variable with a mean of 10,000 and a standard deviation of 2,400.

a. What is the probability of getting more than 12,000 hits?

b. What is the probability of getting fewer than 9,000 hits?

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