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)

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