The mean of 15 observation is 98 . What is the sum of all the observation.

Given: The Mean of 15 observation is 98

 To do: Find the sum of all the observation

Solution:

Mean  =  $\frac{Sum \ of \ all \ observations}{ Number \ of \ observations}$

Mean  =  98

Number of observations   =  15

98  =   $\frac{Sum \ of \ all \ observations }{ 15}$

Rewrite,

$\frac{Sum \ of all \ observations}{15}  =  98$

Sum of all observations  =  $98  \times  15$

Therefore ,Sum of all observations  =  1470