The mean of 20 observation is 30. On checking it was found that two observations were wrongly recorded as 27 and 32 while the correct observations were 31 and 38. Find the correct mean.
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Mean of 20 observatios =15
Sum of 20 observations =15×20=300
Correct sum =300+8+4−3−6
=303
Correct mean=
20
303
=15.15
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