Question: Find the expected value of the random variable. A student models the number of revolutions X on a pencil sharpener that are needed to fully

Find the expected value of the random variable.
A student models the number of revolutions X on a pencil sharpener that are needed to fully sharpen his pencil, by using density

And fx(x) = 0 otherwise.

19) for 19 S ,-1 (z-22) for 20 < s 20 22; x (x)

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