Deter mine whe ther fcx) - x°xe^Io, (x) is 2Pxe^Io, is a vald pdf or not. If it is valid, can you use Theorem 19 and the variance of X ~f ? If YES, then find the mean and the variance of X using Theorem 19. If f is not valid, correct it so that it becomes a valıd pdf and proceed to the part of finding its mean and its vanance. to derive the mean

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