Probablility Questions

by Cole
(Missouri)

I am having difficulty answering the following questions:

Diagram this statement. Then answer the questions that follow.

One fourth of the 64 marbles in the bag were red.

A. How many marbles in the bag were red?
B. How many marbles in the bag were not red.
C. If one marble is drawn from the bag, what is the probability of drawing red?

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Jan 13, 2010
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by: Karin

Hi Cole,

Your questions refers to Probability and I haven't had a chance to create that unit yet! But, I can help.

You have 64 marbles and 1/4 are red.

A. How many marbles are red?
64 * 1/4 = 16

Think: 1/4 of 64 - in Math, "of" means multiply.

16 marbles are red.

B. How many were not red?
You could find this answer two ways:

1. 64 - 16 = 48 - Subtract the amount that are red from the total.
2. 64 * 3/4 = 48 - If 1/4 are red, then 3/4 are not red.

C. If 1 marble is drawn, what is the probability of drawing red?

There are 16 chances out of 48 marbles of it being red: 16/48 = 33.3% probability of being red.

I hope this helps you!

Best of luck,
Karin

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