well, variance is found by using V = n*p*(1-p)p=80% (chances of winning a game)

n=5 (number of games)

expected value of x=4

How do I find the variance and standard deviation of x?

V = 5*.80*.20 = 0.80

The standard deviation is found by taking the square root of the variance.

sigma = sqrt(V) = sqrt(0.80) = .8944

I'm gonna try to figure out the second part of the question now.