Asked by Anonymous

the courier service company has found that their time of parcels to client is normally distributed with a mean of 45 minutes and a standard deviation of 8 minutes. the probability that a randomly selected parcel will take less than 48 minutes to deliver is
Answered by Steve
A handy tool for Z table problems is at

http://davidmlane.com/hyperstat/z_table.html

Play around with a bit, and get comfortable with this kind of question.
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