1.

There are 30 boys and 20 girls in a class. The mean and variance of their marks in maths are, respectively, 65 and 100. If 5 grace marks are added to the score of each students, then the revised mean and variance will be respectively.

Answer»

`70, 100`
` 70, "variance " gt 100`
` 65, "variance " LT 100`
` 65, 100`

ANSWER :A


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