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Suppose that X1,...,X81 are independent random variables with probability density function fX(x) = 0.5exp(−x/2), x >...

Suppose that X1,...,X81 are independent random variables with probability density function fX(x) = 0.5exp(−x/2), x > 0. Approximate P(X1 +···+ X81 > 170).

A. 0.67 B. 0.16 C. 0.33 D. 0.95 E. none of the preceding

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