Answer to Question #40161 in Statistics and Probability for Ryan

Question

1) Suppose 40% of the students in a certain college are female. Suppose further that 15% of the females and 10% of the males are smokers. (a) What fraction of the smokers are female? (b) What is the probability that a student chosen at random is a non-smoker?


2) The time (in hours) a customer spends in a particular store is an exponential random variable T, with E[T] = ½
The time spent in the store by one customer is independent of the 2 number of other customers and their time spent in the store. (a) What is the probability that a customer will spend more than 1 hour in the store? (b) If 5 customers enter the store at the same time, what is the probability that the number of them that remain in the store 1 hour later is 2 or more?

Answer 1

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