paynelily21 paynelily21

10-05-2017
Mathematics

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if you role a number cube 12 times about how many times do you expect to role a number less than 5

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mreijepatmat mreijepatmat

10-05-2017

I guess this cube is a dye & it has six faces numbered from 1 to 6.

If so the expected value is the probability x number of times:

P(getting 1 or 2 or 3 or 4) = 4/6 = 2/3

The number of times = 10, hence the expected value is 12x(2/3) = 8 times

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