Question

the mean of 10 numbers is 55 if one is included their mean becomes 60 find the new mean
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Answer 1

Answer:

The new number is 110.

Step-by-step explanation:

Mean of 10 numbers is 55.

Sum of 10 numbers=(55×10)

=550.

New mean of 11 numbers is 60.

So,sum of 11 numbers=(11×60)

=660.

New number that is added=(660-550)

=110.