Question 751450
X ~ Binomial(42, 0.62)
a. P(X = 21) = {{{(matrix(2,1,42,21))(0.62^21)(0.38^21)}}} = {{{highlight(0.0352)}}}

b. P(X ≤ 18) = {{{sum((matrix(2,1,42,x))(0.62^x)(0.38^(42 - x)),x = 0,18)}}} = {{{highlight(0.0091)}}}