A commercial airline finds that, over the last 60 days, a mean of 207.5 ticketed passengers actually

Question:

A commercial airline finds that, over the last 60 days, a mean of 207.5 ticketed passengers actually show up for a particular 7:24 A.M. flight. The standard deviation of their data is 12 passengers.
a. Assuming this is normal, find the 95% confidence interval.
b. If the plane seats 225 passengers, what is the probability the plane will be overbooked?
Distribution
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