Probability Problems

Question

Question #10:

A glass jar contains 6 red, 7 green, 9 blue, and 3 yellow marbles. If a single marble is chosen at random from the jar, what is the probability of choosing a

(a) red marble?   

(b) green marble?   

(c) blue marble?   

Answer 1

The jar contains 6 red, 7 green, 9 blue, and 3 yellow marbles. That's 25 total marbles in the jar.

So the probability of getting a red marble in a single draw is the number of red marbles divided by the total number of marbles, or 6/25.

It's the same to calculate the probabilities for getting green or blue marbles. The probability of getting a green marble is 7/25, and the prob of getting a blue marble is 9/25.

Hope that helps!