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3 years ago

Find the circumference of the following circle. Use 3.14 for π. Round to the nearest hundredth

Mathematics

2 answers:

Digiron [165]3 years ago

8 0

Answer:

56.55

Step-by-step explanation:

C=2πr=2·π·9≈56.54867cm

LuckyWell [14K]3 years ago

5 0

Formula for the circumference of a circle:

C = 2πr (C = circumference π(pi) = 3.14..... r = radius)

You know:

r = 9 cm

π = 3.14 So substitute/plug it into the equation

C = 2πr

C = 2(3.14)(9)

C = 56.52 cm

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Answer:

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37734 35202 2532

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$=\sqrt{\dfrac{(2532-939.5)^2+(3664-939.5)^2+(740-939.5)^2 ...+(285-939.5)^2}{8-1}}$

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b)SD= 1441.21

c)Calculate a 99% two-sided confidence interval on the difference in mean life.

confidence level =99%

significance level =α= 0.01

Degree of freedom = n-1 = 8-1 =7

So, $t_{\frac{\alpha}{2}}=3.499$

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Substitute the values

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confidence interval $= 939.5 - 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$ to $= 939.5 + 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$

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