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Normal Distribution Probabilities

Please use Excel when necessary:

Access time to a supercomputer mainframe is normally distributed with an average(mean) of 92 minutes a day with standard deviation of 11 minutes. Find the probability that on a certain day, the access time is:

a) Less than 60 minutes
b) More than 100 minutes
c) Between 70 and 90 minutes
d) Between 1 and 2 hours

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