Question

how to find hrade of 72,70,79,64,60,64,69,75

Answer 1

$\binom {count \: all \:the \: marks}{count \: \: the \: total \: marks \: with \: respect \: to \: no \: of \: subjects} \times 100\\ \binom{mark \: secured}{total \: mark} \times 100 \\ = \binom{553}{640} \times 100 \\ = 86.40\%$
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