Mathematics, 22.10.2020 16:01 UratazZ
The mean mark of a group of 10 boys is 58. If the mean of 7 of them is 61, what is the mean of the remaining 3 boys
Answers: 2
), dimensionless, is:
(Eq. 1)
)
(Eq. 1b)
is the mark of the i-th boy, dimensionless.
(Eq. 2)
)
(Eq. 2b)
(Eq. 3)
- Mean mark of the first 7 boys, dimensionless.
- Mean mark of the remaining 3 boys, dimensionless.![\frac{1}{10}\cdot [\Sigma_{i = 1}^{7}x_{i}+\Sigma_{i=8}^{10}x_{i}] = 58](/tpl/images/0831/3175/34272.png)
![\frac{1}{10}\cdot [7\cdot (61)+3\cdot p_{3}] = 58](/tpl/images/0831/3175/e9792.png)
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The mean mark of a group of 10 boys is 58. If the mean of 7 of them is 61, what is the mean of the r...
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