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13 July, 12:05

Gill rolls a number cube 78 times. How many times can he expect to roll an odd number greater than 1?

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  1. 13 July, 14:05
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    Im assuming its just a regular number cube with 6 numbers

    there are only 2 odd numbers above 1 (3 and 5)

    so the ratio is 2/6

    you want to know how manny times (x) will you roll those numbers out of 78 roll

    the ratio is x/78

    multiply

    (2/6) = (x/78)

    cross multply to give you 6x = 156 and divide by 6

    to give you x = 26
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