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3 years ago

BRAINLIEST!!PLEASE HELP ME!

Mathematics

2 answers:

Andru [333]3 years ago

8 0

Easiest way I could think of is choose a point in the gray area and use the X,Y to plug into the answers whichever one makes sense is correct.

DiKsa [7]3 years ago

8 0

The answer is b I just graphed it on Desmos

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Which ratio is equivalent to the given ratio? 45:63 Select each correct answer.

Liono4ka [1.6K]

5:7, 15:21. Hope this helps!!!

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3 years ago

What is 10 1/3 + 7/9 =

Effectus [21]

Is about 11.1111hope that helped

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3 years ago

2×3×5×7 is the prime factorization of what number?

Alina [70]

Multiply the numbers together

2 x 3 = 6

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3 years ago

Plzz help! bralilest asap

Nonamiya [84]

Answer:

C: a reflection across the y axis rotated 180 degrees

Step-by-step explanation:

The y axis is a vertical line, the same like that the trapezoid is flipped across

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4 years ago

Read 2 more answers

Suppose that the population of the scores of all high school seniors who took the SAT Math (SAT-M) test this year follows a Norm

Vlad1618 [11]

Answer:

Confidence = $1-\alpha=1-0.01=0.99$

And then the confidence level would be given by 99%

Step-by-step explanation:

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Assuming the X follows a normal distribution

$X \sim N(\mu, \sigma)$

The distribution for the sample mean is given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

$\bar x =512$ represent the sample mean

$\sigma=100$ represent the population standard deviation

n= 100 sample size selected.

The confidence interval is given by this formula:

$\bar X \pm z_{\alpha/2} \frac{\sigma}{\sqrt{n}}$ (1)

The marginof error for this case is given by Me=25.76. And we know that the formula for the margin of error is given by:

$Me=z_{\alpha/2} \frac{\sigma}{\sqrt{n}}$

$25.76=z_{\alpha/2} \frac{100}{\sqrt{100}}$

And we can find the critical value $z_{\alpha/2}$ like this:

$z_{\alpha/2}=\frac{25.76(\sqrt{100})}{100}=2.576$

And we know that on the right tail of the z score =2.576 we have $\alpha/2$ of the total area. We can find the area on the right of the z score using this excel code:

"=1-NORM.DIST(2.576,0,1,TRUE)" or using a table of the normal standard distribution, and we got 0.004998= $\alpha/2$ , so then $\alpha=0.00498*2=0.009995 \approx 0.01$ , and then we can find the confidence like this:

Confidence = $1-\alpha=1-0.01=0.99$

And then the confidence level would be given by 99%

8 0

3 years ago