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EleoNora [17]
1 year ago
5

The interior angles of a triangle are

Mathematics
1 answer:
lbvjy [14]1 year ago
4 0

Answer:

8x+13y = 130

Step-by-step explanation:

sum of interior angles in a triangle is 180 degree

interior angles are (5x+3y)∘,(3x+20)∘, and (10y+30)

add all the angles and make it equal to 180

5x+3y+3x+20+10y+30= 180

combine like terms

5x+3y+3x+20+10y+30= 180

8x+13y+x+50= 180

subtract 50 from both sides

8x+13y = 130

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Answer:

a) ME=2.58 \sqrt{\frac{0.413(1-0.413)}{900}}=0.0423

b) 0.413 - 2.58 \sqrt{\frac{0.413(1-0.413)}{900}}=0.371

Step-by-step explanation:

1) Data given and notation  

n=900 represent the random sample taken    

X=372 represent the students were pursuing liberal arts degrees

\hat p=\frac{372}{900}=0.413 estimated proportion of students were pursuing liberal arts degrees

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z would represent the statistic (variable of interest)    

p_v represent the p value (variable of interest)    

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2) Solution to the problem

The confidence interval would be given by this formula

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For the 99% confidence interval the value of \alpha=1-0.99=0.01 and \alpha/2=0.005, with that value we can find the quantile required for the interval in the normal standard distribution.

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The margin of error is given by:

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If we replace we have:

ME=2.58 \sqrt{\frac{0.413(1-0.413)}{900}}=0.0423

And replacing into the confidence interval formula we got:

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0.413 + 2.58 \sqrt{\frac{0.413(1-0.413)}{900}}=0.455

And the 99% confidence interval would be given (0.371;0.455).

We are confident (99%) that about 37.1% to 45.5% of students were pursuing liberal arts degrees.

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Therefore the answer is 4.1

I hope that was helpful!

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