The mean of $25$ observations was found to be $78.4$ . But at the time of checking it was found that $96$ was misread as $69$ , the corrected mean is

80

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79

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75.48

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79.48

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Solution

The correct option is C $79.48$
Incorrect mean $= 78.4$ Number of observations $= 25$
Misread observation is $= 69$ correct observation $= 96$
Thus corrected mean $= \frac{78.4 \times 25 - 69 + 96}{25} = 79.48$

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Similar questions

Q. The mean of

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Question 12
Mean of 50 observations was found to be 80.4. But later on, it was discovered that 96 was misread as 69 at one place. Find the correct mean.

Mean of 20 observations is 15.5. Later it was found that the observation 24 was misread as 42. The corrected mean is:

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The mean of 25 observations was found to be 78.4. But at the time of checking it was found that 96 was misread as 69, the corrected mean is

The correct option is C 79.48Incorrect mean =78.4 Number of observations =25Misread observation is =69 correct observation =96 Thus corrected mean =78.4×25−69+9625=79.48

The mean of $25$ observations was found to be $78.4$ . But at the time of checking it was found that $96$ was misread as $69$ , the corrected mean is

The correct option is C $79.48$
Incorrect mean $= 78.4$ Number of observations $= 25$
Misread observation is $= 69$ correct observation $= 96$
Thus corrected mean $= \frac{78.4 \times 25 - 69 + 96}{25} = 79.48$