3 years ago

X - 1 = 30x^-1 solve for x

Mathematics

1 answer:

k0ka [10]3 years ago

8 0

Answer:

x=−5 or x=6

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Step-by-step explanation:

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Step-by-step explanation:

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3 years ago

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3 years ago

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Answer:

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3 years ago

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3 years ago

A recent poll of 700 people who work indoors found that 278 smoke. if the researchers want to be 98% confident of their results

Mice21 [21]

Answer:

We are given:

$\hat{p}=\frac{278}{700}=0.397$

$z_{\frac{0.02}{2}}=2.33$ is the critical value at 0.02 significance level

$E=0.035$ is the margin of error

Therefore, the required sample size is:

$n=\hat{p}(1-\hat{p}) \left(\frac{z_{\frac{0.02}{2}} }{E} \right )^{2}$

$=0.397(1-0.397) \left( \frac{2.33}{0.035} \right)^2$

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Therefore, the required sample size n = 1061

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3 years ago