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dybincka [34]
3 years ago
14

The circumference of a circle is 12.3 in what is the radius of the circle

Mathematics
1 answer:
Rasek [7]3 years ago
7 0

Answer: r≈1.96

Step-by-step explanation:

C=2πr

Solving for r

r=C

2π=12.3

2·π≈1.95761

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Answer:

We need a sample size of 564.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

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Based upon a 95% confidence interval with a desired margin of error of .04, determine a sample size for restaurants that earn less than $50,000 last year.

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0.04\sqrt{n} = 1.96\sqrt{0.6231*0.3769}

\sqrt{n} = \frac{1.96\sqrt{0.6231*0.3769}}{0.04}

(\sqrt{n})^{2} = (\frac{1.96\sqrt{0.6231*0.3769}}{0.04})^{2}

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