Average of the squares of the first n natural numbers

The same question, asked 2 times: 12 Sep 2024 S2*, 25 Sep 2024 S1. Every wording below, oldest first.

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Question 1
12 Sep 2024 S2
51 $The average of the squares of the first 46 natural numbers is$
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Question 2
25 Sep 2024 S1
64 $The average of the squares of the first 48 natural numbers is$
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