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3 years ago

If the circumference of a certain circle of radius r is greater than the area of the enclosed circular region then

Mathematics

1 answer:

shepuryov [24]3 years ago

4 0

Your answer is E because that isn't possible.

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From a population of 200,000,000 elements, the standard deviation is known to be 14. A sample of 49 elements is selected. It is

Talja [164]

Answer:

The standard error of the mean = 2

Step-by-step explanation:

Given that:

The standard deviation σ = 14

The sample size n = 49

The sample mean $\overline x$ = 56

The formula for calculating the standard error can be expressed as:

$S.E = \dfrac{\sigma}{\sqrt{n}}$

$S.E = \dfrac{14}{\sqrt{49}}$

$S.E = \dfrac{14}{7}$

S.E = 2

Therefore, the standard error of the mean = 2

4 0

2 years ago

Two trains, train A and train B, weigh a total of 251 tons. Train A is heavier than Train B. The difference of their weights is

olga55 [171]

Train A weighs 181 tons and train B weighs 70 tons.

3 0

2 years ago

Can someone explain these math questions to me

kolbaska11 [484]

Should be choice 1 x being your slope and y your y- intercept

4 0

3 years ago

A lumber company is making boards that are 2920.0 millimeters tall. If the boards are too long they must be trimmed, and if the

Effectus [21]

Answer:

The value of the test statistic is of 0.22.

Step-by-step explanation:

Our test statistic is:

$t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

In which X is the sample mean, $\mu$ is the expected mean, $\sigma$ is the standard deviation(square root of the variance) and n is the size of the sample.

A lumber company is making boards that are 2920.0 millimeters tall.

This means that $\mu = 2920$ .

A sample of 12 is made, and it is found that they have a mean of 2922.7 millimeters with a variance of 121.00.

This means that $X = 2922.7, n = 12, \sigma = \sqrt{121} = 11$ . So

$t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

$t = \frac{2922.7 - 2922}{\frac{11}{\sqrt{12}}}$

$t = 0.22$

The value of the test statistic is of 0.22.

4 0

2 years ago

I think it's B but idk

Sergeu [11.5K]

You are correct. The answer is B.) They are congruent because they are corresponding angles.

Nice job! Hope this helped :)

4 0

2 years ago

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