Let X be the amount of time (in hours) the wait is to get a table at a restaurant. Suppose the cdf is represented by

F(x)= { 0 x < 0
{ x²/16 0 < x < 4
{ 1 x > 4

Use the cdf to determine σX​.

a) 2.3094
b) 0.8889
c) 2.9428
d) 5.3333
e) 0.9428
f) None of the above