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4 years ago

Value of this pronumeral

Mathematics

1 answer:

STatiana [176]4 years ago

4 0

90+80+90+x=360
260+x=360
x=100

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Solve each system by elimination.<br>3) 9x - 5y = 13<br>- 4x + 5y = 22

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Answer:

x=7, y=10. (7, 10).

Step-by-step explanation:

9x-5y=13

-4x+5y=22

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5x=35

x=35/5

x=7

9(7)-5y=13

63-5y=13

5y=63-13

5y=50

y=50/5

y=10

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Calculate the volume of a cylinder of diameter 6cm and height 10cm

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Step-by-step explanation:

565.2

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A newsgroup is interested in constructing a 90% confidence interval for the proportion of all Americans who are in favor of a ne

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Answer:

The 90% confidence interval for the proportion of all Americans who are in favor of a new Green initiative is (0.6247, 0.6923).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the z-score that has a p-value of $1 - \frac{\alpha}{2}$ .

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This means that $n = 533, \pi = \frac{351}{533} = 0.6585$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a p-value of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.6585 - 1.645\sqrt{\frac{0.6585*0.3415}{533}} = 0.6247$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.6585 + 1.645\sqrt{\frac{0.6585*0.3415}{533}} = 0.6923$

The 90% confidence interval for the proportion of all Americans who are in favor of a new Green initiative is (0.6247, 0.6923).

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3 years ago

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s2=$33.50/(50/4)gal=$2.68 per gallon

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So supplier #3 has the best deal.

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3 years ago

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Answer:

Step-by-step explanation:

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3 years ago

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