flights are cleared in 45 min, so 5% of the flights take longer to clear. Let's also assume that the distribution is approximately normal.
a) If the standard deviation of the time to clear an international flight
is 5 min, what is the mean time to clear a flight?
b) Suppose the standard deviation is 10 min, not the 5 min suggested
in part a. What is the new mean?
c) A customer has 30 min from her flight landed to catch her
limousine. Assuming a standard deviation of 10 min, what is the
likelihood that she will be cleared in time?
更新1:
回king_of_physics: For Q1 & Q2, 95% should be 1.96 not 1.645, right? so Q1 answer= 35.2 and Q2 answer = 25.4 how to calculate Q3? Many thanks!