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CBSE Class 9 Answered

The arithmetic 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 arithmetic mean.
Asked by | 17 Mar, 2013, 05:46: PM
answered-by-expert Expert Answer
The arithmetic mean = Sum of all observations/Number of observations
Hence, sum of all observations = 24*100 = 2400
 
Now, 6 is added to each of the observations, so the sum would be 2400 + 100*6 = 3000
And then, each of them is multiplied by 2.5. So, the new sum of all observations = 3000*2.5 =7500
 
Hence mean - 7500/100 = 75
Answered by | 17 Mar, 2013, 06:54: PM

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