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Two high scho...

Question

Two high school classes took the same test. One class of $20$ students made an average grade of $80$ %; the other class of $30$ students made an average grade of $70$ %. The average grade for all students in both classes is

A

75

%

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B

74

%

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C

72

%

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D

77

%

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E

None of these

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Solution

The correct option is A $74$ %
$A v e r a g e = \frac{20.80 + 30.70}{20 + 30} = 74$ .

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