1.

the mean of 6 numbers is 20. if one number is deleted then the mean is 15. find the deleted number

Answer»

If the mean of 6 no.s is 20, then the sum of all the no.s will be 20*6= 120.Now, if 1 no. is deleted then the mean is 15, so the sum of the remaining 5 no.s will be 15*5= 75.Therefore, the no. is 120-75=45



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