# The mean of 10 numbers is 7 and the mean of 15 numbers is 12.find the mean of these 25 numbers taken together.

2
by sreelakshmign

2015-02-25T19:16:07+05:30

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The mean of 10 numbers is 7 hence their sum will be 70. In the same way sum of the 15 numbers will be 180. Now sum of 25 numbers is 70+180=250. And their mean is 250÷25=10...
2015-02-25T19:20:46+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Mean of 10 numbers is 7
So, sum of 10 numbers is 10*7 = 70
Mean of 15 numbers is 12
So, sum of 15 numbers is 15*12 = 180
Sum of 25 numbers = 180 + 70 = 250
Mean of 25 numbers = 250 / 25 = 10
Thus the mean of 25 numbers is 10.
how can u do product of 10*7=70 by keeping sum