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Question 123
The average of 18 observations is recorded as 124. Later it was found that two observations with values 64 and 28 were entered wrongly as 46 and 82. Find the correct average of the 18 observations.
Solution
Average of 18 observation = 124
Total observation = $$124 \times 18$$ = 2232
Actual total observation will be = 2232- (46+82) + (64+28) = 2196
Actual avg. will be = $$2196 \div 18 $$= 122
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