6
QuizMultiple Choice

Experimental Probability — Quiz

Question 6 • Grade 7 Mathematics

A number cube was rolled as part of an experiment. The results are displayed in the given table. Number 1 2 3 4 5 6 Frequency 4 6 5 7 3 5 What is the best explanation of how to find the experimental probability of rolling a 3?

Answer
A
To find the experimental probability of rolling a three, write a ratio of the number of times three occurs to the total number of trials. Simplify if necessary.
B
To find the experimental probability of rolling a three, write a ratio of the total number of trials to the number three. Simplify if necessary.
C
To find the experimental probability of rolling a three, write a ratio of the number three to the total number of trials. Simplify if necessary.
D
To find the experimental probability of rolling a three, write a ratio of the total number of trials to the frequency of the number three. Simplify if necessary.

Explanation

Experimental probability is the number of times the event occurred divided by the total number of trials. The number 3 occurred 5 times, and the total number of rolls was 4 + 6 + 5 + 7 + 3 + 5 = 30, so the probability is 5/30, or 1/6. Choice A correctly describes this ratio.

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