arithmetic

A set of 7 numbers has a mean of 9. What
additional number must be included in this set to create a new set with a mean that is 3 less than the mean of the original set?

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  1. (7(9) + x)/8 = 6
    63 + x = 48
    x = -15

    So you would have to add a negative number ?

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    posted by Reiny

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