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

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

 Class Frequency 10 - 20 15 20 - 30 25 30 - 40 20 40 - 50 12 50 - 60 8

Less than cumulative frequency can be obtained by adding to the other frequencies.
 Class Frequency Less than type Cumulative Frequency 10 - 20 15 Less than 20 15 20 - 30 25 Less than 30 40 (= 15 + 25) 30 - 40 20 Less than 40 60 (= 40 + 20) 40 - 50 12 Less than 50 72 (= 60 + 12) 50 - 60 8 Less than 60 80 (= 72 + 8)

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