Benny the barber (see question 1) is considering the addition of a second chair. customers would be selected for a haircut on a fcfs basis from those waiting. benny has assumed that both barbers would take an average of 20 minutes to give a haircut, and that business would remain unchanged with customers arriving at a rate of two per hour. find the following information to benny decide if a second chair should be added: part (a): the average number of customers waiting.

part (b): the average time a customer waits.

part (c): the average time a customer is in the shop.

Historically, 12 percent of a mail-order firm's repeat charge-account customers have an incorrect current address in the firm's computer database. the number of customers out of 19 who have an incorrect address in the database is a binomial random variable with n = 19 and 2formula36.mml = 0.12.

Stephen barrett,md previous writing experience ?

The management of a private investment club has a fund of $250,000 earmarked for investment in stocks. to arrive at an acceptable overall level of risk, the stocks that management is considering have been classified into three categories: high risk (x), medium risk (y), and low risk (z). management estimates that high risk stocks will have a rate of return of 15%/year; medium risk stocks, 10%/year; and low risk stocks, 6%/year. the amount of money invested in low risk stocks is to be twice the sum of the amount invested in stocks of the other two categories. if the investment goal is to have a rate of return of 9% on the total investment, determine how much the club should invest in each type of stock. (assume that all the money available for investment is invested.)