###
**The average of a collection of 20 measurements was calculated to tb 56 cm. But later it was found that a mistake had occurred in one of the measurement which was recorded as 64 cm., but should have been 61 cm. The correct average must be.**

A. 53 cm
B. 54.5 cm
C. 55.85 cm
D. 56.15 cm
**Answer: Option C**

## Show Answer

Solution(By Apex Team)

$\begin{array}{l}\text{According to the question,}\\
\text{Correct average}\\
=\Large\frac{20 \times 56-64+61}{20} \\
=\Large\frac{1120-3}{20} \\
=\Large\frac{1117}{20} \\
=55.85 \mathrm{~cm}
\end{array}$

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