Question

the mean of 50 observations was 250. later it was found out that 152 was wrongly copied as 102 for the computation of means. find the correct mean

Answer 1

Answer:the mean of 50 observation=250

So, sum of all observation=50×250=12500

After knowing that 102 was 152

Then sum of observation=12550

So, correct mean=12550÷50=251

Step-by-step explanation:

Answer 2

Step-by-step explanation:

Solution- : The mean of 50 observation is 250

So,50×250

=12500

So, 102 is wrongly copied as 152

Next 152-102=50

12500+50=12550

Therefore, the correct mean is = 12550÷50=251

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