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 ???
Answer (1)
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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