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Interval 30​-39 40​-49 50​-59 60-69 70-79 80-89 Open in StatCrunch + Copy to Clipboard + Open...

Interval

30​-39

40​-49

50​-59

60-69

70-79

80-89
Open in StatCrunch +
Copy to Clipboard +
Open in Excel +

Frequency

2

18

44

18

55

2

Standard

deviation

​(Round to one decimal place as​ needed.)

math   Statistics-And-Probability   
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Answer #1
Midpoint (X) Frequency(f) Freq*X (X-mean) (X-mean)2 f*(X-mean)2
34.5 2 69 -28.058 787.226 1574.453
44.5 18 801 -18.058 326.075 5869.355
54.5 44 2398 -8.058 64.924 2856.664
64.5 18 1161 1.942 3.773 67.916
74.5 55 4097.5 11.942 142.622 7844.211
84.5 2 169 21.942 481.471 962.942
Total -> 139 8695.5 - - 19175.54

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