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The average of 25 observations is 13. It was later found that an observation 73 was wrongly entered as 48. The new average is
it is given that average of 25 observation = 13
Average = $$\frac{SumofObservation}{NumberofObservation}$$
13 = $$\frac{Sum}{25}$$
Sum = 325
it is given that 73 is entered as 48 and hence new and corrected sum = 325 - 48 + 73 = 350
New and corrected average = $$\frac{350}{25}$$ = 14
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