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 CShow Answer
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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