Q. 45.0( 1 Vote )

The mean of 15 nu

Answer :

Given that, mean of 15 numbers = 44

Mean can be given by



Where, x = Sum of all observations


& n = Total number of observations


Here, Mean = 44 and n = 15.


So,



x = 44 × 15


x = 660


We have sum of all observations = 660


If 7 is subtracted from each of the 15 numbers, then the new sum of all observations = 660 – (15 × 7)


New sum of all observations = 660 – 105 = 555


Now, we have fresh data: x’ = 555, n = 15



New mean = 37


Thus, new mean of the observation is 37.


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