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Lostsunrise [7]
2 years ago
8

Find X. Round to the nearest tenth. Law of Cosines : c2 = 22 + b2 - 2ab cos C

Mathematics
1 answer:
fiasKO [112]2 years ago
7 0

Answer:

70.5°

Step-by-step explanation:

22² = (20)²+(18)² - 2(20)(18) cos X

484 = 400 + 324 - 720 cos X

-240 = -720 cosx

1/3 = cos X

cos^{-1}(\frac{1}{3}) = X

X = 70.52877937

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Out of a sample 650 high school students, 321 take the bus to school every day. construct a 99% confidence interval for the popu
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A 99% confidence interval for the population mean of high school students that take the bus to school every day is b) ci=(44.34%, 54.43%)

We need to find the 99% confidence interval for the population mean of high school students that take the bus to school everyday

A confidence interval is a range of estimates for an unknown parameter. The confidence interval is calculated at the specified confidence level; the most common is the 95% confidence level, but sometimes other levels are used, such as 90% or 99%.

The confidence interval of proportions is given by:

π ± z √(π (1-π) /n)

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For 99% confidence interval the value of z is 2.58

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<u>Learn more about confidence interval:</u>

brainly.com/question/28052710

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