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lesya [120]
3 years ago
12

Simplify the expression 3(x + 4)

Mathematics
2 answers:
Varvara68 [4.7K]3 years ago
6 0
3(x+ 4)
3x + 12
-3 -3
x = 9
erica [24]3 years ago
6 0
The answer is x=9 hope this helps
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A random sample of 70 printers discovered that 25 of them were being used in small businesses. find the 95% limit for the popula
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The sample proportion of printers used in small business is:

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The 95% confidence interval for the population proportion of printers that are used in small businesses is:

\hat{p} \pm z_{\frac{0.05}{2}} \sqrt{\frac{\hat{p}(1-\hat{p})}{n} }

Where:

z_{\frac{0.05}{2}}=1.96 is the critical value at 0.05 significance level

\therefore 0.3571 \pm 1.96 \sqrt{\frac{0.3571(1-0.3571)}{70} }

         0.3571 \pm 0.1122

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Therefore, the 95% confidence interval for the population proportion of printers that are used in small businesses is (0.245 , 0.469)



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