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Arithmetic Mean and Range

The mean of m...

Question

The mean of marks scored by 100 students was found to be 40. Later it was discovered that a score of 53 was misread as 83 . Find the correct mean

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Solution

mean =sum of observations / total num. of obs.

40= sum of observation / 100

4000 = sum of obser.

new mean = sum of obser. +53 -83 /100

new mean=4000-30 / 100

new mean = 39. 7

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