Question

A box contains 5 red marbles, 8 white marbles and 4 green marbles. One marble is taken out of the box at random. What is the probability that the marble taken out will be
(i) red ? (ii) white ? (iii) not green?

Answer 1

Solution: Total number of outcomes = 5 + 8 + 4 = 17

Number of red marbles = 5

Number of white marbles = 8

Number of green marbles = 4

(i) Red?

Solution: Probability of red marbles;

P(R) = 5/17

(ii) White?

Solution: Probability of white marbles;

P(W) = 8/17

(iii) Not green?

Solution: Probability of green marbles;

P(G) = 4/17

Or, P( not G)

= 1 - 4/17

=13/17