Question 9 (i)
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 red?

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Solution

Total number of marbles in the box = 5+8+4 = 17
Total Number of elementary events = 17
There are 5 red marbles in the box.
$∴$ Favourable number of elementary events = 5
$∴$ P(getting a red marble) = $\frac{5}{17}$

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Q. Question 9 (ii)
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 white?

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Probability

Standard IX Mathematics

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Question 9 (i) 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 red?

Total number of marbles in the box = 5+8+4 = 17 Total Number of elementary events = 17 There are 5 red marbles in the box. ∴ Favourable number of elementary events = 5 ∴ P(getting a red marble) = 517

Question 9 (i)
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 red?

Total number of marbles in the box = 5+8+4 = 17
Total Number of elementary events = 17
There are 5 red marbles in the box.
$∴$ Favourable number of elementary events = 5
$∴$ P(getting a red marble) = $\frac{5}{17}$