Question

What is the cumulative frequency of the second class interval

Answer 1

The cumulative frequency for the second class or interval is the Frequency of the second class plus the cumulative frequency of the first interval/class (16 + 2 = 18). The above process continues through the last interval, at which point the cumulative total equals the sum of the frequencies (40)

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Answer 2

The cf of the second class interval will be the addition of the 1st frequency and the frequency of the 2nd class.

For ex- If the frequency of 1st is 2 so cf will also be 2 but for 2nd if the frequency is 4 so cf will be 2+4=6

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