Find the mean of the 32 numbers, such that if the mean of 10 of them is 15 and the mean of 20 of them is 11. The last two numbers are 10.
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Mean of 20 no.=18
Sum of 20 no.=20×18 i.e.360
When 2 is added to each no.,we get
360+(20×2)
=400
Now,new mean value of 20 no.=400÷20
=20
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