Question: When I have a frequency table with a range, how do I find the standard deviation? I'm being asked to find the the standard deviation

When I have a frequency table with a range, how do I find the standard deviation?

I'm being asked to find the the standard deviation for the table below. I was given the first two columns (x and freq) and I filled in rel freq and cumulative. Which numbers do I use to find standard deviation? I tried using cumulative but didnt get an answer that was an optiuon on the homework

x freq rel freq cumulative rel freq

16-21.45 23 0.46 0.46

21.45 - 26.9 4 0.08 5.75

26.9 - 32.35 9 0.18 5.93

32.35 - 37.8 7 0.14 6.07

37.8 - 43.25 6 0.12 6.19

43.25 - 48.7 1 0.02 6.21

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