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Standard deviation of a population

Justin did push-ups for the past 55 days.The following data points are the number of push-ups he did each day.
21,24,24,27,2921,24,24,27,29
Find the standard deviation of the data set.
Round your answer to the nearest hundredth.
  • Your answer should be
  • an integer, like 66
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}
push-ups