3 years ago

Stuck on this pls helpThx

Mathematics

1 answer:

Len [333]3 years ago

8 0

Answer:

Step-by-step explanation:$400x.30=$120

400-120=280

$280x.10=28

280-28=252

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Step-by-step explanation:

The confidence interval for population mean is given by :-

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Critical value : $z_{\alpha/2}=2.576$

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Then, 99% confidence interval for population mean will be :_

$4\pm\ (2.576)\dfrac{6.1}{\sqrt{41}}\\\\\approx4\pm2.45\\\\=(4-2.45, 4+2.45)=(1.55, 6.45)$

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Stuck on this pls helpThx​

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