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# Central Limit Theorem problem Watch

1. Could anyone explain why in the problem below (answer is included), 1.96 is multiplied by (19.5/420), which is SD/n rather than SD/(n^(1/2)) as would by my understanding from the central limit theorem? why is 'n' not square rooted?
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2. (Original post by EdReed)
Could anyone explain why in the problem below (answer is included), 1.96 is multiplied by (19.5/420), which is SD/n rather than SD/(n^(1/2)) as would by my understanding from the central limit theorem? why is 'n' not square rooted?
AFAIK, it should be? Perhaps it's a mistake?

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Updated: April 9, 2016
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