All categories

3 years ago

Create a problem where division would come before multiplication

Mathematics

1 answer:

NeX [460]3 years ago

3 0

4 divided by 3 times 2

You might be interested in

A chemist examines 15 geological samples for potassium chloride concentration. The mean potassium chloride concentration for the

NikAS [45]

Answer:

$0.376-2.145\frac{0.0012}{\sqrt{15}}=0.375$

$0.376+2.145\frac{0.0012}{\sqrt{15}}=0.377$

And we are 95% confident that the true mean of chloride concentration is between 0.375 and 0.377 cc/ cubic meter

Step-by-step explanation:

Data provided

$\bar X=0.376$ represent the sample mean for the chloride concentration

$\mu$ population mean (variable of interest)

s=0.0012 represent the sample standard deviation

n=15 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula:

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

Since we need to find the critical value first we need to begin finding the degreed of freedom

$df=n-1=15-1=14$

The Confidence is 0.95 or 95%, the significance would be $\alpha=0.05$ and $\alpha/2 =0.025$ , and the critical value for this case with a t distribution with 14 degrees of freedom is $t_{\alpha/2}=2.145$

And the confidence interval is:

$0.376-2.145\frac{0.0012}{\sqrt{15}}=0.375$

$0.376+2.145\frac{0.0012}{\sqrt{15}}=0.377$

And we are 95% confident that the true mean of chloride concentration is between 0.375 and 0.377 cc/ cubic meter

7 0

3 years ago

[(4x + 15) / 5x)] = 1/2

Arada [10]

One way in which to approach this problem would be to treat it as an equation of ratios and to cross multiply:

<span>[(4x + 15) / 5x)] = 1/2 could be written as:

4x + 15 1
----------- = ---
5x 2

Then 8x + 30 = 5x

3x = -30, and so x = -10 (answer). Be certain to check this answer through substitution!

</span>

6 0

3 years ago

Please help me:( I've been stuck on this for so long

Contact [7]

Answer:\

S=4

Step-by-step explanation:

Hope this helped!!!!!

6 0

3 years ago

Read 2 more answers

Similar triangles ... help?

jolli1 [7]

Answer:

The second answer

XYZ-RQS

Step-by-step explanation:

8 0

3 years ago

If an object is rotated clockwise 130° around a center and then counterclockwise 75° around the same center, what is the angle b

Keith_Richards [23]

That would be 130 - 75 = 55 degrees answer

6 0

3 years ago

Create a problem where division would come before multiplication​

Create a problem where division would come before multiplication