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July 2, 2015

Homework Help: probability

Posted by Jennifer on Monday, January 21, 2013 at 10:30pm.

suppose that the times taken to complete an online test are normally distributed with a mean of 45 minutes and a standard deviation of 12 minutes. find the probability
a. that for a randomly selected test, the time taken was more than 1 hour.

b. that the mean number of minutes taken by a random sample of 24 tests is less than 50 minutes

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