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17 December, 11:19

1. The average of 9 numbers in a list is 6. What is the sum of these 9 numbers?

2. Then the number 26 is added to the list. What is the average of the 10 numbers in the new list?

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  1. 17 December, 11:48
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    (1) average = sum / 9

    6 = sum / 9

    sum = 6*9 = 54

    (2) new average = (sum + 26) / 10 = (54+26) / 10 = 8

    new average is 8
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