I need help with that ASAP

Mathematics

1 answer:

r-ruslan [8.4K]3 years ago

4 0

Answer:

Step-by-step explanation:

Okay so the ∠2 = 40deg. That means ∠2 + ∠6 = 180

∠6 = 180 - 140

Same goes for ∠1, ∠1 + ∠2 = 180, ∠1 = 180 - 40 = 140

∠1 + ∠6 = 140 + 140 = 280degrees = Ans D

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Answer:

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Step-by-step explanation:

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Answer:

n=350

Step-by-step explanation:

Notation and definitions

$n$ random sample taken (variable of interest)

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A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

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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In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by: