Let X have density
fx(x) = 1/5
for 2 ≤ x ≤ 7
and fx(x) = 0 otherwise.
a. Find the expected value of X2, i.e., E(X2).
b. Find the expected value of 1/X2, i.e., E(l/X2).
c. Find the variance Vav(X).
d. Find the standard deviation σx.