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If the mean of 25 observation …

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If the mean of 25 observation is 27 and each observation is decreased by 7 , what will be the new mean

Posted by Raushan Kumar 4 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 4 years, 9 months ago

Mean of given observations = sum of given observations/ total number of observations
Mean of 25 observations = 27
∴ Sum of 25 observations = 27 × 25 = 675

If 7 is subtracted from every number, then the sum = 675 – (25 × 7) = 675 – 175 = 500
Then, new mean = 500/25 = 20

Thus, the new mean will be 20.

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CBSE > Class 10 > Mathematics