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Find less than type cumulative frequency curve {{10-20,15},{20-30,25},{30-40,20},{40-50,12},{50-60,8}}

Solution:
Your problem `->` less than type cumulative frequency curve {{10-20,15},{20-30,25},{30-40,20},{40-50,12},{50-60,8}}


To draw Less than type cumulative frequency curve, we first prepare the following table

ClassFrequency
`f`
< Upper`cf`
0 - 10-100
10 - 20152015
20 - 30253040
30 - 40204060
40 - 50125072
50 - 6086080









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