Question

The arthimetic mean of 10 items is 50 .If each item is added by 5 then new arthimetic mean is

Answer 1

Answer: 55

Step-by-step explanation:

$Arithmetic \ mean = \dfrac{Sum \ of \ observations}{No. \ of \ observations}$

Arithmetic mean of 10 observations = 50

50 = Sum of all 10 observations / 10

∴ Sum of all 10 observations = 500

5 is added to each observation. So the total added to all the sum is 10 × 5 = 50.

∴ New sum of all 10 observations = 500 + 50 = 550

∴ New arithmetic mean = 550 / 10 = 55