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
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