The average marks in Science subject of a class of students is 68. If the marks of two students were 48 and 65 of the actual marks 72 and 61 respectively, then what would be the correct average?

68.5

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69.5

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Solution

The correct option is B 69
Here, sum of added quantities - sum of removed quantities = $\pm$ N. x
$\Rightarrow$ (72 + 61) - (48 + 65) = $\pm$ 20 . x
$\Rightarrow$ 133 - 113 =20.x
$\Rightarrow$ $x = \frac{20}{20} = 1$
So, actual average = 68 + 1= 69

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