Question

The mean of 8 observations is 7. If 3 is added to each observation find the new mean

Answer 1

TOTAL = 8*7

==> 56

SO, 56+3 ==> 59

ANSWER = 59

Answer 2

The new mean is 10.

Step-by-step explanation:

Given,

The mean of 8 observations = 7

Number of observations = 8 and mean = 7

To find, the new mean = ?

We know that,

Total =  Mean × Number of observations

= 7 × 8

= 56

If 3 is added to each of the 8 observations.

∴ The sum of the values will increase by  (3 × 8) = 24

New total = 56 + 24 = 80

∴ New Mean $\dfrac{Total number}{Number of observations}$

$=\dfrac{80}{8} =10$

Hence, the new mean is 10.