Hi,

I was given a moment generating function M(t) = (1-t)^-3

However, I'm told to compute P (-5 < X < 4) if I can (or explain if I can't compute).

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If I'm not wrong the random variable (X) is gamma with parameters (2,1).

But X must be at least 0. So does do I compute P (-5 < X < 4) = P (0 < X < 4) ? Or is it un-computable? If so, how do I explain?

Can anyone help? Thanks.