Question

The mean of a dataset is given as 25 and the sum of all the observations present in the dataset is 250. How many observations are present in the dataset?

• A. 10

Answer 1

The correct option is A 10
Let there be $n$ observations or data points in the dataset.
As we know,
$\text{Mean or Average}=\frac{\text{Sum of all observations}}{\text{Number of obsevations}}$

i.e., $25=\frac{250}{n}$

$\Rightarrow n=\frac{250}{25}=10$

Therefore, there are 10 observations in the dataset.