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vovikov84 [41]
2 years ago
11

Find the value of y for the given value of x. y=2−9x;x=23

Mathematics
2 answers:
Rus_ich [418]2 years ago
8 0

Put x = 23 to the equation y = 2 - 9x:

y = 2 - 9(23) = 2 - 207 = -205

<h3>Answer: x = 23 and y = -205</h3>
Morgarella [4.7K]2 years ago
4 0

Y= -205

Step-by-step explanation:

Y=2-9x x=23

Y=2-9(23)

Y=2-207

Y= -205

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In a sample of 70 stores of a certain​ company, 62 violated a scanner accuracy standard. It has been demonstrated that the condi
uysha [10]

Answer:

We need at least 243 stores.

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 zscore that has a pvalue of 1 - \frac{\alpha}{2}.

The margin of error of the interval is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

For this problem, we have that:

n = 70, p = \frac{62}{70} = 0.886

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

Determine the number of stores that must be sampled in order to estimate the true proportion to within 0.04 with 95​% confidence using the​ large-sample method.

We need at least n stores.

n is found when M = 0.04. So

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.04 = 1.96\sqrt{\frac{0.886*0.114}}{n}}

0.04\sqrt{n} = 1.96\sqrt{0.886*0.114}

\sqrt{n} = \frac{1.96\sqrt{0.886*0.114}}{0.04}

(\sqrt{n})^{2} = (\frac{1.96\sqrt{0.886*0.114}}{0.04})^{2}

n = 242.5

Rounding up

We need at least 243 stores.

5 0
2 years ago
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Delicious77 [7]

Answer:

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2 years ago
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2 years ago
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Brainlyist to whoever answers first
levacccp [35]

Answer:

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8 0
2 years ago
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