Random Variable and Probability

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Asked: April 8, 20212021-04-08T14:18:19+00:00 2021-04-08T14:18:19+00:00In: High School/Senior Secondary School, Statistics and Probability

Random Variable and Probability

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A box contains red and green balls. The number of green balls is 1/3 the number of red balls. If a ball is taken randomly from the box, what is the probability that the ball is red?

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Sengemegz · Answer 1 · 2021-04-09T03:56:53+00:00

Sengemegz Moderator

2021-04-09T03:56:53+00:00Added an answer on April 9, 2021 at 3:56 am

This answer was edited.

Let the number of green balls be $x$

The number of red balls will be $\dfrac{1}{3}x$

Total balls = $x + \dfrac{1}{3}x=\dfrac{4x}{3}$

P( Red ball)= $\dfrac{1}{3}x \div \dfrac{4x}{3}$

P( Red ball)= $\dfrac{1}{3}x \times \dfrac{3}{4x}$

P(Red ball)= $\dfrac{1}{4}$

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