The personnel director at hospital A wanted a study made of overtime hours and associated costs of the ten nurses were randomly selected and the following data was collected for August: (table in picture below)

- What is the Standard deviation of the number of hours of over time worked per nurse (Round answer to nearest decimal place)?
- What was the average hourly overtime pay rate per nurse (Round answer to nearest decimal place)?
- What is the variance of the average hourly overtime pay rate per nurse (Round answer to nearest 2 decimal place)?