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3 years ago

14

Jhoathan can type a 20 page document in 40 minutes susun can type it in 30 minutes and jack can type it in 24 minutes working to

gether how much time will it take them to type the same document

1 answer:

bagirrra123 [75]3 years ago

7 0

31.3 minutes or 31 minutes

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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

Write the equation for the area (A) in terms of length (l) of a playground if the width (w) is one half as long as the length (l

Dvinal [7]

Let, the length = l
Width = l/2

Area = l * w = l * l/2 = l²/2

So, Your Final Answer would be A = l²/2

Hope this helps!

5 0

3 years ago

Pleas help !!!! Need explanation as well

Fynjy0 [20]

Answer:

B, they are independent events separate from each other.

Step-by-step explanation:

Being born a female wouldn’t affect the colorization of the creature, they would both be independent events separate from each other.

4 0

3 years ago

Read 2 more answers

What is the factorization of the trinomial below?

Oksi-84 [34.3K]

Step-by-step explanation:

-x² + 2x + 48

-x² - 6x + 8x + 48

-x( x + 6 ) + 8( x + 6)

( x + 6 ) ( -x + 8 )

6 0

3 years ago

Identify the classification to which this figure belongs . You must select all that apply

slavikrds [6]

Answer:

select A,C,E, and F

Step-by-step explanation:

3 0

3 years ago