The taxi and takeoff time for commercial jets is random variable x with a mean of 8.4 minutes and a standard deviation of 3.3 minutes assume that the distribution of taxi and takeoff times is approximately normal you may assume that the jets are lined up on a runway so that one taxies and takes off immediately after the other and that they take off one at a time on a given runway what is the probability that for 40 jets on a given runway total taxi and takeoff time will be less than 320 minutes?

Q: find the probability that their lengths of pregnancy have a mean that is less than 260 days.

A: Let M denote the mean length of pregnancies for the same of size n = 25.

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