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elena-14-01-66 [18.8K]
3 years ago
13

Given thesinθ = 8/17 the ratio for cosine of θ is . Enter your answer as a fraction.

Mathematics
2 answers:
balu736 [363]3 years ago
5 0
Cos^2=1-sin^2
=1-64/289
225/289
LekaFEV [45]3 years ago
4 0

Step-by-step explanation:

using Pythagoras theorem adjacent will be 15

so cos will be adjacent/hypotenuse

which is 15/17=0.882

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A sample size of at least 531 is required.

Step-by-step explanation:

We are lacking the confidence level to solve this question, so i am going to use a 90% confidence level.

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So it is z with a pvalue of 1-0.05 = 0.95, so z = 1.645

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

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A sample size of at least n is required.

n is found when M = 0.05

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So

M = z*\frac{\sigma}{\sqrt{n}}

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0.05\sqrt{n} = 1.645*0.7

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