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OpenStudy (anonymous):
the mean wait time for a bus is 7.5 minutes with a standard deviation of 1.3 minutes. What is the probability that a person will wait less than five minutes? 75% of wait times is greater than how many minutes?
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OpenStudy (anonymous):
help!
OpenStudy (tkhunny):
(5 - 7.5)/1.3 = z
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