The average of 25 observations is 13. It was later found that an observation 73 was wrongly entered as 48. The new average is –

A) 12

B) 14

C) 16

D) 18

According to the question,
Average of 25 observations = 13
Sum of 25 observations = 13 × 25 = 325
One observation entered wrongly 48 instead of 73.
∴ Difference = 73 – 48 = 25 (less)
∴ Actual sum of 25 observation = 325 + 25 = 350
Actual average =  550/25

                             = 14

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