If r is a binomial random variable (i.e. the number of successes in a Bernoulli Trials experiment), compute the following probabilities.
(a) Pr(r≤2),n=3,p=0.7
(b) Pr(r>1),n=4,p=0.7
(c) Pr(r<2),n=3,p=0.3
(d) Pr(r≥4),n=5,p=0.9