A box has 3 blue, 2 white, and 4 red marbles. One marble is picked at random. What is the probability that it is:
(i) White?
(ii) Blue?
(iii) Red?
Solution:
Total marbles = 3 (blue) + 2 (white) + 4 (red) = 9
(i) White marbles = 2
P(white) = 2/9
(ii) Blue marbles = 3
P(blue)=3/9 = 1/3
(iii) Red marbles = 4
P(red) = 4/9
Check:
P(white) + P(blue) + P(red) = 2/9 + 3/9 + 4/9 = 9/9 = 1