William W. answered • 02/13/19
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I'm unsure what the data is that you have listed. Perhaps it came through funny or something. What are the dashes?
Tricia G.
The chart has 2 columns Class/Frequency
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02/13/19
Tricia G.
Answer?
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02/13/19
William W.
tutor
Oh, sorry, It's a little unusual to calculate standard deviation based off a frequency distribution table - better to use the raw data. If doing it based on the Freq dist table, your TI-84 calculator can do it.
1) Enter the midpoints of the frequency bins (example: 63.5 for the first one) into List 1
2) Enter the frequencies into List 2
3) Use "stat", "calc", "1-Var Stats"
4) Use List 1 for the List
5) Use List 2 for the FreqList
6) Hit "Calculate"
The Sample Standard Deviation (Sx) turns out to be 8.46867 so the Variance is that number squared or 71.718
Looks like you would just use one decimal in your answers based on the directions.
Hope this helps.
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02/13/19
Tricia G.
The 61-66 is the Class Column and the 11 is the frequency. The data is in a chart/table02/13/19