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The mean of 25 observations was found to be 78.4. But later on it was found that 96 were misread as 69. The correct means is-

A. 76.54 B. 78.4 C. 79.48 D. 81.32 Answer: Option C
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Solution(By Apex Team)

$\begin{array}{l}\text{Correct sum}\\ \text{= (78.4 × 25 + 96 – 69)}\\ =1987\\ \therefore\text{Correct mean}\\ =\Large\frac{1987}{25}\\ =79.48\end{array}$

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