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2 years ago

Plzzz help i will give brainliest if i can

Mathematics

1 answer:

Alla [95]2 years ago

3 0

Answers: choice C and choice E

Plugging x = 3 and y = -1 into both equations of choice C lead to a true result (the same number on both sides). This is why the system of equations listed in choice C is one possible answer. Choice E is a similar story.

If your teacher didn't mean to make this a "select all that apply" type of problem, then it's likely your teacher may have made a typo.

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The sugar content of the syrup in canned peaches is normally distributed. A random sample of n = 10 cans yields a sample standar

Serggg [28]

Answer:

The 95% confidence interval is given by:

3.30<σ<8.76

Step-by-step explanation:

1) Data given and notation

s=4.798 represent the sample standard deviation

$\bar x$ represent the sample mean

n=10 the sample size

Confidence=95% or 0.95

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population mean or variance lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

The Chi Square distribution is the distribution of the sum of squared standard normal deviates .

2) Calculating the confidence interval

The confidence interval for the population variance is given by the following formula:

$\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma^2 \leq \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}$

The next step would be calculate the critical values. First we need to calculate the degrees of freedom given by:

$df=n-1=10-1=9$

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a tabel to find the critical values.

The excel commands would be: "=CHISQ.INV(0.025,9)" "=CHISQ.INV(0.975,9)". so for this case the critical values are:

$\chi^2_{\alpha/2}=19.022$

$\chi^2_{1- \alpha/2}=2.700$

And replacing into the formula for the interval we got:

$\frac{(9)(4.798)^2}{19.022} \leq \sigma \frac{(9)(4.798)^2}{2.700}$

$10.892 \leq \sigma^2 \leq 76.736$

Now we just take square root on both sides of the interval and we got:

$3.30 \leq \sigma \leq 8.76$

So the best option would be:

3.30<σ<8.76

7 0

2 years ago

Four tickets cost $62. Each ticket costs

xz_007 [3.2K]

Answer:

Step-by-step explanation:

Divide 62 by 4

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3 years ago

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Four people are carpeting a house. Heidi carpets 1/6 of the house, Lisa carpets 16% of the house, Martina carpets 0.2 of the hou

Lina20 [59]

Heidi : 1/6 = 0.166
Lisa : 16% = 0.160
Martina : 0.200
Jaydie : 0.180

least to greatest : Lisa, Heidi, Jaydie, Martina

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3 years ago

Diana had 41 stickers. She put them in 7 equal groups. She put as many as possible in to each group. She gave the leftover stick

mr Goodwill [35]

She gave Diana, her sister, 6 stickers. This is because 41 divided by 7 is 5 R 6 and there are 6 stickers left if you want each group to have the same amount with no leftovers.

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3 years ago

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X + 4 5/6 = 9 x + 3 5/6 = 8 What is x? x has to be the same in each equation

topjm [15]

Answer:

x= 25/6 it is the same in both equations

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2 years ago