the mean of the marks of 200 candidate was found to be 40 later it was discover that a score of the 40 was wrongly read as 50 the correct mean is ???

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the mean of the marks of 200 candidate was found to be 40 later it was discover that a score of the 40 was wrongly read as 50 the correct mean is ???

naveenkalyanam309 12th Jul, 2021

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Answer (1)

puneetpotter 12th Jul, 2021

Let x be the sum of all 200 numbers.

Than, x / 200 = 40

=> x = 8000

Now, we have to replace 40 by 50, i.e., the new sum is x - 40+ 50.

=> New mean = x - 40 + 50

= 8000 - 40 + 50

= 7990

Therefore, new mean = 7990 / 200 = 39.95.

Hope the solution helps!

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