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Q22Section A (Section A)22 of 60

Mean and tail of a logistic variable

Let XX be a continuous random variable with the probability density function

f(x)=ex(1+ex)2,−∞<x<∞.f(x)=\frac{e^x}{(1+e^x)^2},\quad -\infty<x<\infty.

Then E(X)E(X) and P(X>1)P(X>1), respectively, are

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