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barxatty [35]
3 years ago
15

4x + y = 46.75 help!! A 8.50 B 8.75 C 9.50 D12.75

Mathematics
1 answer:
WARRIOR [948]3 years ago
3 0

Answer:

d is the answer

Step-by-step explanation:

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Answer: -3.0593

Step-by-step explanation:

The test statistic for the difference between two population mean (when population standard deviations \sigma_1\ \&\ \sigma_2  are known ) is given by :-

z=\dfrac{\overline{x}_1-\overline{x}_2}{\sqrt{\dfrac{\sigma_1^2}{n_1}+\dfrac{\sigma_2^2}{n_2}}}

where ,

n_1\ \&\ n_2 = Sample sizes taken from two  populations 1 and 2.

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\overline{x}_1=2.95\ \&\ \overline{x}_2=3.3

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We assume that the data follows a normal distribution.

Then, the test statistic will be :-

z=\dfrac{2.95-3.3}{\sqrt{\dfrac{(0.65)^2}{55}+\dfrac{(0.56)^2}{58}}}\\\\=\dfrac{-0.35}{\sqrt{0.0130887}}\\\\=\dfrac{-0.35}{0.1144059}=3.05928278174\approx-3.0593  

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4 years ago
Find the value of x <br><br> a. 40<br> b. 50<br> c. 80<br> d. 60<br> Please someone help soon!!
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Step-by-step explanation:

The sum of the interior angles of a quadrilateral is 360°, so the missing angle is ...

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Step-by-step explanation:I don't say you have to mark my ans as brainliest but plz don't forget to thank me if it has really helped you...

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