Standard Deviation: Videos & Practice Problems

A population consists of $\text{4 hours}$, $\text{7 hours}$, and $\text{15 hours}$ of study time per week, based on a student survey. Select samples of two values with replacement from this population and list all possible pairs. For each of the nine possible samples, calculate the variance by considering each sample as an entire population and applying the population variance formula, which includes division by n. Finally, compute the average of these nine population variances.