In Exercises, find (a) The mean of the distribution, (b) The standard deviation of the distribution, and

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In Exercises, find 

(a) The mean of the distribution, 

(b) The standard deviation of the distribution, and 

(c) The probability that the random variable is between the mean and 1 standard deviation above the mean.

The length of time (in days) required to learn a certain task is a random variable t with probability density function defined by

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