Assume the length X, in minutes, of a particular type of
Chapter , Problem 2.123(choose chapter or problem)
Assume the length X, in minutes, of a particular type of telephone conversation is a random variable with probability density function f(x) = 1 5 ex/5, x> 0, 0, elsewhere. (a) Determine the mean length E(X) of this type of telephone conversation. (b) Find the variance and standard deviation of X. (c) Find E[(X + 5)2].
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