Question

The mean of 10 observations is 40. If 35 is misread as 53. What is the correct mean ?

Answer 1

The mean of 10 observations is 40

Sum = mean × number of observation = 40×10 = 400

If 35 is misread as 53, correct sum will be :
Correct sum = 400 - 53 + 35 = 382

correct mean = 382 ÷ 10 = 38.2

Answer 2

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if The mean of 10 observations is 40

then..
====================
Totally mean=) Sum ×No.of observation
=)10×40
=)400

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If If 35 is misread as 53.

Original mean=)400-53+35
=)382

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A/Q

Correct mean=)382/10=38.2

Thanks!!!!