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lbvjy [14]
3 years ago
6

If the radius is 6371, what is the circumference?

Mathematics
2 answers:
olga2289 [7]3 years ago
7 0
The formula to find the circumference is pi*radius^2. Since your radius is 6371, the radius squared is 40589641 and that times pi is 127451473. That is your circumference
Anni [7]3 years ago
3 0
In order to find the circumference of a circle, you must use the formula c=2*\pi*r. 

Since you're already given the radius, all you have to do is use the formula and do 2 times 3.14 times 6371 and you get 40009.88 as your circumference. 

Would love brainliest and hope that helps! 
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Answer:

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Step-by-step explanation:

We are given the following in the question:

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Alpha, α = 0.05

Sample standard deviation, s = 8.3

First, we design the null and the alternate hypothesis

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We use Two-tailed z test to perform this hypothesis.

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z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}} }

Putting all the values, we have

z_{stat} = \displaystyle\frac{22.8 - 24}{\frac{8.3}{\sqrt{100}} } = -1.44

We calculate the p-value with the help of standard z table.

P-value = 0.1498

Since the p-value is greater than the significance level, we accept the null hypothesis. The population mean is 24.

Now, z_{critical} \text{ at 0.05 level of significance } = \pm 1.96

Since,  the z-statistic lies in the acceptance region which is from -1.96 to +1.96, we accept the null hypothesis and conclude that the population mean is 24.

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