the mean of 26 number is 20 . if on number is deleted , then mean is 15. find the delete number
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the mean of 6 numbers is 20.
therefore the sum of 6 numbers =20*6=120
if one number is deleted their mean =15
therefore mean of remaining 5 numbers =15
the sum of the remaining 5 numbers = 15*5=75
thus the deleted number = sum of 6 numbers - sum of 5 numbers other than deleted number
=120-75
=45
thus the deleted number is 45.
therefore the sum of 6 numbers =20*6=120
if one number is deleted their mean =15
therefore mean of remaining 5 numbers =15
the sum of the remaining 5 numbers = 15*5=75
thus the deleted number = sum of 6 numbers - sum of 5 numbers other than deleted number
=120-75
=45
thus the deleted number is 45.
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