3 years ago

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Mathematics

1 answer:

Brrunno [24]3 years ago

4 0

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A 90% confidence interval for a proportion is found to be (0.62, 0.68). What is the sample proportion?

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B. 0.65

Step-by-step explanation:

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(0.62+0.68)/2

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0.65

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Solve x2 – 7x = –13.

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$x^{2} -7x=-13$

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$x^{2} -7x+3.5^{2}=-13+3.5^{2}$

$x^{2} -7x+12.25=-13+12.25$

$x^{2} -7x+12.25=-0.75$

Rewrite as perfect squares

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remember that

$i=\sqrt{-1}$

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Simplify

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<u>the answer is</u>

$x1=3.5+\frac{\sqrt{3}}{2}i$

$x2=3.5-\frac{\sqrt{3}}{2}i$

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