Answer :

By observing the above-given marks of 40 students, we can construct the table as follows:

**(a)** Students who have scored marks equal to and more than 7 = No. of students with marks 7 +No. of students with marks 8 + No. of students with marks 9

5 + 4 + 3

= 12

**(b)** Students who have scored marks less than 4 =No. of students with marks 1 + No. of students with marks 2 + No. of students with marks 3

2 + 3 + 3

= 8

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