A jar contains 20 red balls, 12 white balls, and 8 blue balls. Suppose 6 balls are randomly selected with replacement. Let Y₁ be the number of red balls selected, Y₂ the number of white balls selected, and Y3 the number of blue balls selected. Find (a)p(3, 2, 1), (b) E(Y₂), (c) V (Y₁), (d) E(Y₃ | Y₁ = 2, Y₂ = 1), (e) Cov(Y₁, Y₂).

Ans. (a) 0.135 (b) 1.8 (c) 1.5 (d) 0.6 (e) 0.9