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14 July, 08:56

The mean of five numbers is 6. if one of the numbers is removed, the mean becomes 7. what is the value of the number that was removed?

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  1. 14 July, 09:18
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    mean = sum/number

    so 6 = sum/5 6 x 5 = sum. 6 x 5 = 30

    7 = 30-r/4

    28=30-r

    30-28 = r

    r=2

    so the number 2 was removed
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