Question

A bag contains 5 red, 8 black and 7 white balls. One ball is chosen at random. What is the probability that the chosen ball is black?

(a) $\frac{2}{3}$

(b) $\frac{2}{5}$

(c) $\frac{3}{5}$

(d) $\frac{1}{3}$

Answer 1

ANSWER:
(b) $\frac{2}{5}$
Explanation:
Total number of balls in the bag = 5 + 8 + 7 = 20
Number of black balls = 8
Let E be the event that the chosen ball is black.
∴ Required probability = P(E) = $\frac{8}{20}$= $\frac{2}{5}$