Stress Is Applied to a 20-In $\frac { 100 } { 7 }$

Stress is applied to a 20-in. steel bar that is clamped in a fixed position at each end. Let X = distance from the left end at which the bar snaps. Suppose Y/20 has a standard beta distribution with E(Y) = 10 and V(Y) = $\frac { 100 } { 7 }$
a. What are the parameters of the relevant standard beta distribution?
b. Compute $P ( 8 \leq Y \leq 12 )$
c. Compute the probability that the bar snaps more than 2 in. from where you expect it to.