In a normal distribution, which of the following statements is true regarding the $\mathrm{mean}$ and the $\mathrm{median}$?

Given the population data set $2,0,1,9$, what is the variance of this population?

If an observation has a z-score of $0$, which of the following is true?

What is the standard deviation of the following sample data: $2$, $6$, $2$, $0$, $5$?

Given the population data set $3,1,2,9,5$, what is the standard deviation of this population (rounded to two decimal places)?

The standard deviation of the distribution of sample means is $\frac{\sigma }{\sqrt{n}}$.

Which of the following values can the variance of a dataset never be?

Which of the following statements about the standard deviation of a dataset is correct?

Which of the following values can never be the numerical value of the standard deviation of a data set?