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Prepare a cumulative frequency table for the given distribution.

Class Interval 50-60 60-70 70-80 80-90 90-100
Frequency 2 7 12 9 5

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Class Interval Frequency Cumulative Frequency
50-60 2 2
60-70 7 9(2+7)
70-80 12 21(2+7+12)
80-90 9 30(2+7+12+9)
90-100 5 35(2+7+12+9+5)

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