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OleMash [197]
3 years ago
12

Only answer the second one please

Mathematics
2 answers:
Ilia_Sergeevich [38]3 years ago
7 0

Answer:

y=5/6x+8 is what I got as the answer ✅

KengaRu [80]3 years ago
5 0
Equation is: y=5/6x+8
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Please help me with this homework
ehidna [41]

Answer:

3

Step-by-step explanation:

3² + 4² = 5²

Hope this helps :)

5 0
3 years ago
A manufacturer reported a sample mean = 22.0 g and a sample standard deviation = 2.5 g based on a sample of 20 of their products
tester [92]

Answer:

n=(\frac{1.640(2.5)}{2})^2 =4.2 \approx 5

So the answer for this case would be n=5 rounded up to the nearest integer

Step-by-step explanation:

Previous concepts

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 means 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.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X=22 represent the sample mean

\mu population mean (variable of interest)

s=2.5 represent the sample standard deviation

n represent the sample size  

ME = 2 represent the margin of error accepted

Solution to the problem

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

The margin of error is given by this formula:

ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}    (2)

And on this case we have that ME =2 and we are interested in order to find the value of n, if we solve n from equation (2) we got:

n=(\frac{z_{\alpha/2} s}{ME})^2   (3)

We can use as estimator for the population deviation the sample deviation \hat \sigma = s

The critical value for 90% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.05;0;1)", and we got z_{\alpha/2}=1.640, replacing into formula (3) we got:

n=(\frac{1.640(2.5)}{2})^2 =4.2 \approx 5

So the answer for this case would be n=5 rounded up to the nearest integer

6 0
3 years ago
What is the sum of (2/5x+6) and (3/5x-9)
user100 [1]

::::::::::::::::::::::::::::::::::::deleted::::::::::::::::::::::::::::

7 0
3 years ago
Read 2 more answers
Solve. 3(x+1)-2x=-6
RideAnS [48]
D.)  x = - 9


C.) x = 0

Hope that helps, Good luck! (:



4 0
3 years ago
Solve the equation -7 = y for x.
Harlamova29_29 [7]

Answer:

x = 4y+28

Step-by-step explanation:

x/4 -7 = y

Solve for x

Add 7 to each side

x/4  -7+7 = y+7

x/4 = (y+7)

Multiply each side by 4

x/4*4 = 4(y+7)

x = 4y+28

5 0
2 years ago
Read 2 more answers
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