Question

Ed intends to roll a six-sided number cube 100 times. What probability model can he use to predict whether or not each roll will give a result that is a composite number?

A. Each roll has a 0.117 probability of being composite
B. Each roll has a 0.333 probability of being composite
C. Each roll has a 0.5 probability of being composite
D. Each roll has a 0.667 probability of being composite

Answer 1

The answer is Each roll has a 0.333 probability of being composite.

(I just took the test, B was the answer)

Answer 2

The probability model of getting a composite number in each roll is;

B. Each roll has a 0.333 probability of being composite

How to find the Probability?

A composite number is a number that can have more than 2 factors.

In a six sided number cube from 1 to 6, 4 and 6 have more than 2 factors and as such there are 2 numbers that are composite numbers.

Thus, probability model of getting a composite number in each roll is;

P(Composite number) = 2/6 = 0.333

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