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. 12.6 B. 14 C. 15 D. 13.8 Answer: Option B

Solution(By Apex Team)

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 $\begin{array}{l}\text{Actual average }\\ =\Large\frac{350}{25}\\ =14\end{array}$

A. 20
B. 21
C. 28
D. 32

A. 18
B. 20
C. 24
D. 30

A. 10 years
B. 10.5 years
C. 11 years
D. 12 years