Question 1027091
(a)  1 - .15 - .41 - .18 - .15 = .11

(b)  P(x>2) = 0.44 ==> there is 44% probability that a randomly selected undergraduate student will take 3 or more courses.

(c)  P(x ≤ 3) = 0.74

(d)  1-0.15  = 0.85

(e)  E(X) = 1*0.14 + 2*0.41 + 3*0.18 + 4*0.11 + 5*0.15 = 2.69

{{{Var(X) = E(X^2) - (E(X))^2 = 1^2*0.14 + 2^2*0.41 + 3^2*0.18 + 4^2*0.11 + 5^2*0.15  - 2.69^2 = 1.6739}}} 
==> standard deviation = {{{sqrt(1.6739) = 1.2938}}}