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20 December, 08:25

George sold 18, 22, 26, 12, 25, 20, and 19 cars per month over the past seven months. He followed the steps below to determine the number of cars he needs to sell in the next month to have a mean number of sales per month of 24.

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  1. 20 December, 08:52
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    (18 + 22 + 26 + 12 + 25 + 20 + 19 + x) / 8 = 24

    (142 + x) / 8 = 24 ... multiply both sides by 8

    142 + x = 24 * 8

    142 + x = 192

    x = 192 - 142

    x = 50 ... so he would have to sell 50 cars in order to have a mean of 24
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