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02/07/2021 11:49 am
Topic starter
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?
1 Answer
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02/07/2021 11:50 am
The Total no. of balls = 5 + 8 + 4 = 17
P(E) = (Number of favourable outcomes/ Total number of outcomes)
(i) Total number of red balls = 5
P (red ball) = 5/17 = 0.29
(ii) Total number of white balls = 8
P (white ball) = 8/17 = 0.47
(iii) Total number of green balls = 4
P (green ball) = 4/17 = 0.23
∴ P (not green) = 1-P(green ball)
= 1 - (4/7) = 0.77