Discussion

Explanation:

Since the question mention 7 consecutive natural numbers, the first 7 natural numbers can also be considered.

The first 7 natural numbers are (1, 2, 3, 4, 5, 6, 7) and their average is 4.

When the next 3 numbers i.e. 8, 9 and 10 are added, the new average is 5.5.

∴ Average increases by (5.5 – 4) = 1.5

Hence, option (c).

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