If Harriet rolls a number cube 39 times, how many times can she expect to roll a 3 or a 4?

Question

Sullivan Hurley

Mathematics

25 July, 23:40

If Harriet rolls a number cube 39 times, how many times can she expect to roll a 3 or a 4?

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Jaden House · Answer 1

Usually, cubes have 6 sides on them, so the chances of first rolling either 3 or a 4 is 1/3th of a chance. Then, if she rolls it 39 times, I'd do 1/3 of 39, and get 13. She can expect 13 times to roll a 3 or a 4.