The personnel office at a large electronics firm regularly
schedules job interviews and maintains records of the interviews.
From the past records, they have found that the length of a first
interview is normally distributed, with mean μ = 38 minutes and
standard deviation σ = 2 minutes. (Round your answers to four
decimal places.) (a) What is the probability that a first interview
will last 40 minutes or longer? (b) Seven first interviews are
usually scheduled per day. What is the probability that the average
length of time for the seven interviews will be 40 minutes or
longer?