How many roots does this graph have ?

3

Step-by-step explanation:

The answer is Option D:

"The distribution of all values of the statistic resulting from all samples of size taken from the same population."

Step-by-step explanation:

First, is a distribution of all values. It has to include all the possible values of the statistic with its associated probability.

Second, is a distribution of a statistic because we are talking about sample results.

Third, it has to be taken from the same population and have to have the same sample size.