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Books read	Number of students
2	4
3	2
4	9
5	5
8	6

Books read	Number of students
1	2
3	3
6	10
9	6
10	3

Books read	Number of students
0	3
2	6
3	9
6	2
8	6

Practise the method.

Example 1

Example 2

Example 3