Question 367577
The exercise becomes a binomial experiment with P(odd)= p = 0.5 and P(even) = q= 0.5.
a)the expectation is {{{mu = np = 50*0.5 = 25}}}odd numbers.

b) the variance is {{{sigma^2 = npq = 50*.5*.5 = 12.5}}}

c) the SD is just the square root of (b)--around 3.54.