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Standard IX

Mathematics

Mean

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

75

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74

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72

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77

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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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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

The correct option is A 74%Average=20.80+30.7020+30=74.

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

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