Question

You have a jar containing 10 green marbles, 20 blue marbles, 10 white marbles and 15 red marbles for a combined total of 55 marbles. What is the percentage of the following occurring? Express the occurrence’s probability as a fraction. a)     You want to pick one green marble on the first draw   b)    You wish to pick one blue marble on the first draw.

Answer 1

Since you may pick any of the marbles with the same probability, the answers will follow the pattern

`P = \frac{\text{number of required marbles}}{\text{total number of marbles}}`

So, the probability of picking a green marble is

`P = (10)/(55) = (2)/(11)`

And a blue marble is

`P = (20)/(55) = (4)/(11)`