The mean of a set of 9 numbers is 12 . If the mean of the first 5 numbers is 8 , the mean of the other four numbers is
A. 4
B. 10
C. 16
D. 17
E. 25
the mean of 9 numbers
2009-04-17 6:00 pm
回答 (2)
2009-04-17 6:08 pm
✔ 最佳答案
First of all, we better find out the sum of the 9 numbersSum of the 9 numbers = 9 X 12 = 108
Then, Sum of the first 5 numbers = 5 X 8 = 40
Therefore, sum of the other four numbers = 108 - 40 = 68
And so, the mean of the other four numbers
= 68 / 4
= 17
The answer is D.
參考: Physics king
2009-04-19 2:25 am
The answer is really detailed!
收錄日期: 2021-04-19 14:10:40
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