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Explanation:

Total number of students = 45

Total marks obtained = 3 × 0 + 2 × 1 + 2 × 2 + 4 × 3 + 6 × 4 + 7 × 5 + 7 × 6 + 5 × 7 + 3 × 8 + 4 × 9 + 2 × 10
= 0 + 2 + 4 + 12 + 24 + 35 + 42 + 35 + 24 + 36 + 20
= 234

∴ Average = 234/45 = 5.2

Hence, option (c).

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