If r is a binomial random variable (also known as the number of successes in n Bernoulli Trials with probability p of successe on each trial) compute Pr(r) for each of the following cases (a) n=3, r=1, p=0.2 pr(r) = (b) n=4, r=0, p=0.3 pr(r)= (c) n=3, r=1, p=0.5 pr(r) = (d)n=4, r=2,p=0.7 pr(r) = Enter answer as a whole or decimal number