Suppose the length of time a person takes to use an ATM machine is normally distributed with mean u = 110 seconds and standard deviation o = 6 seconds. There aren = 4 people ahead of Jackson in a line of people waiting to use the machine. He is concerned about T = total time the four people will take to use the machine. n USE SALT (a) What is the mean value, u, of T = total time for the four people ahead of Jackson? (b) Assuming that the times for the four people are independent of each other, determine the standard deviation of T. (c) Jackson hopes the total time T is less than or equal to 404 seconds. Find P(T < 404), the probability that the total waiting time is less than 404 seconds. (Round t answer to four decimal places.) P(T < 404) =

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