Help on statistics past paper questions pls?

**arthus123** · May 7th 2009, 02:04 AM

Past exam paper Qs picture by nuclearone - Photobucket

Thanks, help greatly appreciated

**mr fantastic** · May 7th 2009, 04:32 AM

Originally Posted by arthus123

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 $n$ .

**arthus123** · May 7th 2009, 04:56 AM

Thank you mr. fantastic! :O

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