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A class consists of 50 students out of which 30 are girls. The mean of marks scored by girls in a test is 73 (out of 100) and that of boys is 71. Determine the mean score of the whole class.

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72.2

73.9

75.6

answer is A.

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Detailed Solution

Concept- Calculation of arithmetic mean by using frequency
Total student = 50
Girls = 30
So, boys =20
Given mean marks scored by girls

Given mean marks scored by girls

Total sum of marks = 2190+1420 = 3610
So,

Mean score

Hence, the correct answer is option 1.

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