1. The average of 12 observations is 8. After that it is found 13 is replaced by 10 by mistake. What is the correct average of all observations ?
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By: anil on 05 May 2019 01.21 am
Sum of the 12 observations = 12 * 8 = 96 Sum of the observations after correcting the mistake = 96 - 13 + 10 = 93 => Required average = $$frac{93}{12} = 7.75$$
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