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The mean of 100 observations is …

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The mean of 100 observations is 24 if 6 is added to each of the observations and then each of them is multiplied by 2.5, find the new mean

Posted by Rajat Kumar 8 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Rashmi Bajpayee 8 years, 2 months ago

Mean = Sum of observations / Total number of observations

=> 24 = Sum of observations / 100

=> Sum of observations = 24 x 100 = 2400

Now new sum = 2400 + 100 x 6 = 2400 + 600 = 3000

Also, New sum = 3000 x 2.5 = 7500

Then, New Mean = 7500/100 = 75

0Thank You

Rajendra Singh 8 years, 2 months ago

mean of 100 observations = 26

mean after adding 6 to each observation = 24+6 = 30

New mean after multiplying 2.5 = 30 x 2.5 = 75.

0Thank You

ANSWER

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