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 ?
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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