In arguing against the death penalty, Amnesty International has pointed out supposed inequities, such as the many

Question:

In arguing against the death penalty, Amnesty International has pointed out supposed inequities, such as the many times a black person has been given the death penalty by an all-white jury. If jurors are selected randomly from an adult population, find the probability that all 12 jurors are white when the population is
(a) 90% white.
(b) 50% white.