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2 years ago

I need help and the step to find

Mathematics

1 answer:

LUCKY_DIMON [66]2 years ago

4 0

Answer: The answer is 169.

Step-by-step explanation:

Hope this helps! Have a good day! :)

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denpristay [2]

Answer:

1,12

Step-by-step explanation:

First you would mark where x would be and then you would go four down and one to the right to get your z point.

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2 years ago

the area of a rectangular land is 88 square metre & perimeter is 38 metre. what is the length & breadth of the land?

valentinak56 [21]

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Step-by-step explanation:

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2 years ago

suppose a printer can print 15/4 pages in 5/6 of a minute. which TWO statements are correct? A. the unit rate is 9/2 pages per m

Verizon [17]

Answer:

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Step-by-step explanation:

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2 years ago

Read 2 more answers

(10x-20) (6x+8) what is x?

Lilit [14]

X= 2 and x= -8/6 if you make it = 0
(10x-20)(6x+8)=0
10x-20=0
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7 0

2 years ago

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