What is the average marks obtained out of 80 by all the six students together in subject ‘Q’?

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77.5

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88.57

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None of these

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Solution

The correct option is D
62

Average percentage -

$\begin{matrix} = \frac{84 + 79 + 81 + 85 + 66 + 70}{6} = \frac{465}{6} ∴ R e q u i r e d a v e r a g e m a r k s = \frac{465}{6} % o f 80 = \frac{465 \times 80}{6 \times 100} = 62 \end{matrix}$

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