Limits vs Confidence Interval, the difference?

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Below is a question on "limits" and confidence interval. The answers are below.

Why does question b) not require dividing by the square root of 10, but the confidence interval in question c) does?

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In part (c) you're asked about the mean weight of a sample of the tubs and requires the Central Limit Theorem. That means you use $s_{\bar x} = s/\sqrt{n}$ for your standard deviation.