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The mean of 25 observations was found to be 78 4...

This question belongs to Arithmetic Ability Average
Average
?

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-

Answer & Solution
Correct Answer: Option C
Correct sum = (78.4 × 25 + 96 - 69) = 1987
∴ Correct mean
= $$\frac{1987}{25}$$
= 79.48
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