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A factory produces coffee packets. The weight of a packet has a theoretical mean \(\mu=250\) g and a standard deviation \(\sigma=5\) g. We take a random sample of \(n=25\) packets and calculate their average weight \(\overline{X}_{25}\).
Calculate the expected value of the sample mean (round to 1 decimal place).
\(E(\overline{X}_{25})=\)
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Calculate the standard deviation of the sample mean (round to 1 decimal place).
\(\sigma(\overline{X}_{25})=\)
\(\pi\)
\(e\)
\(x\)
\(n\)
\(u_n\)
\(f\)
\(i\)
\(\frac{a}{b}\)
\(\sqrt{\,}\)
\({a}^{b}\)
\(\ln{\,}\)
\(\log{\,}\)
!
\(C\)
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8
9
←
→
\(\sin{\,}\)
4
5
6
(
)
\(\cos{\,}\)
1
2
3
\(\times\)
\(\div\)
\(\tan{\,}\)
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