1. Calculate Class and their frequency table from the following grouped data

Class	Cumulative Frequency
0 - 10	40
10 - 20	36
20 - 30	29
30 - 40	16
40 - 50	5
50 - 60	0

Solution:
First we convert Cumulative frequency table to gropued frequency table

Class	Cumulative Frequency
0 - 10	40
10 - 20	36
20 - 30	29
30 - 40	16
40 - 50	5
50 - 60	0

Class and their frequency table is

Class	Cumulative Frequency	Frequency
0 - 10	40	4 (= 40 - 36)
10 - 20	36	7 (= 36 - 29)
20 - 30	29	13 (= 29 - 16)
30 - 40	16	11 (= 16 - 5)
40 - 50	5	5 (= 5 - 0)

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2. Calculate Class and their frequency table from the following grouped data

Class	Cumulative Frequency
0 - 10	0
10 - 20	5
20 - 30	16
30 - 40	29
40 - 50	36
50 - 60	40

Solution:
First we convert Cumulative frequency table to gropued frequency table

Class	Cumulative Frequency
0 - 10	0
10 - 20	5
20 - 30	16
30 - 40	29
40 - 50	36
50 - 60	40

Class and their frequency table is

Class	Cumulative Frequency	Frequency
10 - 20	5	5 (= 5 - 0)
20 - 30	16	11 (= 16 - 5)
30 - 40	29	13 (= 29 - 16)
40 - 50	36	7 (= 36 - 29)
50 - 60	40	4 (= 40 - 36)

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