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valentinak56 [21]
2 years ago
15

What is .4 as a fraction

Mathematics
2 answers:
Dmitriy789 [7]2 years ago
7 0
2/5 is .4 as a fraction
prohojiy [21]2 years ago
4 0

Answer:

4/10 = 2/5

Step-by-step explanation:

To change the decimal .4 into a fraction, we can put the 4 over 10 because the 4 is in the tenths place. Right now, we have 4/10. We can reduce this fraction (by dividing the numerator and denominator by 2) to 2/5.

I hope this helped and please mark me as brainliest!

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

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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

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The question is asking for the area in square feet of a rectangle that is 4 feet long by 3 feet wide. That area is the product of these dimensions:
  (4 ft)×(3 ft) = 12 ft²
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