3. Construct the frequency table

Construct a frequency distribution of less than type for the following data.
 
Class interval Cumulative frequency
Less than 10 28
Less than 20 38
Less than 30 39
Less than 40 55
Less than 50 74
Less than 60 98
 
Answer:
 
Class interval Frequency
0−20
20−40
20−30
30−40
40−50
50−60
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