Math, asked by yashd4448, 1 year ago

The mean of 20 observations is 12.75. if 2 marks are deducted from each observation, show that the mean marks are also reduced by 2.

Answers

Answered by adyabharadwaj

8

12.75×20=255
255-2×20=215
mean=215÷20=10.75
.•.12.75-10.75=2

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