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The personnel of fice at a large electronics fi rm regularly schedules job interviews and maintains records of the interviews. From the past records, they have found that the length of a fi rst interview is normally distributed, with mean ( = 35 minutes and standard deviation ( = 7 minutes.
(a) What is the probability that a fi rst interview will last 40 minutes or longer?
(b) Nine fi rst interviews are usually scheduled per day. What is the probability that the average length of time for the nine interviews will be 40 minutes or longer? |
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