class interval. - frequency. -cumulative
- frequency
0-10. - 5. - 5
10-20. - 7. - 7
20-30. - 36. - 18
30-40. - 5. - 15
40-50. - 120. - 30
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class interval. - frequency. -cumulative
- frequency
0-10. - 5. - 5
10-20. - 7. - 7
20-30. - 36. - 18
30-40. - 5. - 15
40-50. - 120. - 30
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