Probability As A Fraction Worksheet

Probability As A Fraction Worksheet

Lesson 1

Problem:

There are 98 marbles in a bag and 45 of them are green. If one marble is chosen, what is the probability that it will be red?

Step 1:

Number of cases favoring the event of selecting

total number of different ways

Step 2:

Divide the number of ways to choose a green marble (45) by the total number of marbles (98).

Step 3:

Answer: 45/98

Try two practice problems:

Find the probability of the following.

1. A number from 71 to 91 is drawn at random.
P (a even number).

2. You roll a die numbered from 1 to 6.
P (3).