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The average marks of 30 students are 62 and the average marks of another 20 students are 72. What is the average marks of all the 50 studen…

2446Medium DSSSB TGT Computer Science 0 replies 1 views

The average marks of 30 students are 62 and the average marks of another 20 students are 72. What is the average marks of all the 50 students?

Correct answer: D

Explanation

The total marks are 30 × 62 + 20 × 72 = 1,860 + 1,440 = 3,300, and 3,300 / 50 = 66.

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