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Math Help - Help on statistics past paper questions pls?

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    Help on statistics past paper questions pls?

    Last edited by mr fantastic; May 7th 2009 at 05:32 AM.
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    Quote Originally Posted by arthus123 View Post
    Posted this in wrong section before so here it is.

    Past exam paper Qs picture by nuclearone - Photobucket

    Thanks, help greatly appreciated
    (a) \overline{X} ~ Normal \left( \mu = 30, ~ \sigma = \frac{2.5}{\sqrt{100}} = 0.25\right).

    Calculate \Pr(29.5 < \overline{X} < 30.5).


    (b) 0.4 = z_{0.025} \frac{2.5}{\sqrt{n}}. Solve for n.
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    Thank you mr. fantastic! :O
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