9
QuizMultiple Choice

Theoretical Probability — Quiz

Question 9 • Grade 7 Mathematics

Terry has a number cube that is numbered from 1 to 6 She rolls the cube 50 times. Which equation can be used to predict the number of times that she will roll a number that is greater than 4 ?

Answer
A
P(number greater than 4) is equal to 1 sixth times 50
B
P(number greater than 4) is equal to 5 sixths times 50
C
P(number greater than 4) is equal to 2 sixths times 50
D
P(number greater than 4) is equal to 3 sixths times 50

Explanation

Numbers greater than 4 on a number cube are 5 and 6, so 2 of the 6 outcomes qualify. The probability is therefore 2/6. To predict how many times this happens in 50 rolls, multiply the probability by 50: (2/6) × 50, which is choice C.

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