Question

You have a jar of marbles in front of you 2 are green, 9 are yellow, 3 are white and 7 are red. What is he probability, as a decimal, of selecting a marble that is white or yellow, followed by a marble that is reen?

Answer 1

green marbles = 2

Yellow marbles = 9

White marbles = 3

Red marbles = 7

Total marbles = 2+9 + 3 + 7 = 21

White and yellow marbles = 3+9 = 12

Probability of selecting a marble that is white or yellow = white and yellow marbles / total marbles = 12/21= 0.57

If the marbles are put back after being chosen

Probability of selecting a green marble = 2/21 = 0.095

(12/21) x (2/21) = 0.054