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allochka39001 [22]
3 years ago
10

What is the value of x in the equation? 3x12-7 4 A) B) 1 C) 13 D)

Mathematics
1 answer:
kipiarov [429]3 years ago
5 0

Answer:

TNX ME LATER again HAHA JWK

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An engineer wishes to determine the width of a particular electronic component. If she knows that the standard deviation is 1.6
nexus9112 [7]

Answer:

n=1705

Step-by-step explanation:

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".  

Assuming the X follows a normal distribution  

X \sim N(\mu, \sigma=1.6)  

And the distribution for \bar X is:

\bar X \sim N(\mu, \frac{1.6}{\sqrt{n}})  

We know that the margin of error for a confidence interval is given by:  

Me=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}   (1)  

The next step would be find the value of \z_{\alpha/2}, \alpha=1-0.99=0.01 and \alpha/2=0.005  

Using the normal standard table, excel or a calculator we see that:  

z_{\alpha/2}=\pm 2.58  

If we solve for n from formula (1) we got:  

\sqrt{n}=\frac{z_{\alpha/2} \sigma}{Me}  

n=(\frac{z_{\alpha/2} \sigma}{Me})^2  

And we have everything to replace into the formula:  

n=(\frac{2.58(1.6)}{0.1})^2 =1704.03  

And if we round up the answer we see that the value of n to ensure the margin of error required \pm=0.1 mm is n=1705.  

6 0
3 years ago
HELP PLS! It’s question 15
vredina [299]

Answer:

A: C = 15N

Step-by-step explanation:

30/2 = 15 (the cost of 1 class)

7 0
2 years ago
HELP plsss if I don’t answer this I can’t go to lunch
zhannawk [14.2K]
7/g This is the correct answer to your problem
3 0
3 years ago
HELP but plzz dont waste the answers its a test
aleksley [76]

Answer:

im not sure but i think its 29%

8 0
3 years ago
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GalinKa [24]
The answer is (D) ....
6 0
3 years ago
Read 2 more answers
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