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4.82 Assume the length X, in minutes, of a particular type of telephone conversation is a random
variable with probability density function f(x)={51ex/5,0,x>0elsewhere 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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  • 1. 4.82 Assume the length X, in minutes, of a particular type of telephone conversation is a random variable with probability density function f(x)={51ex/5,0,x>0elsewhere 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].