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Misha Larkins [42]
2 years ago
6

1) 2 -7-19 2) +5=12 3)x-5=4​

Mathematics
1 answer:
nikdorinn [45]2 years ago
6 0
1) 2 -7-19
2x=19+7
2x=26
X=13

2) +5=12
-x/3+5=12
-x+15=36
-x=36-15
-x=21
X=-21

3)x-5=4
3x-20=16
3x=16+20
3x=36
X=12
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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".  

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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.  

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Step-by-step explanation:

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