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Angelina_Jolie [31]
4 years ago
7

Enrique has to pay 80% of a $200 phone bill. Explain how to use equivalent ratios to find 80% of $200.

Mathematics
2 answers:
makkiz [27]4 years ago
6 0

Answer:

Here's a tip, the multiplication symbol can also be represented by the word "of" so you equation is 80% of 200. You can put that in a calculator, or if you want to do it on paper, just know this: % symbol means that it is divided by 100. So, You can put in a calculator 80% x 200 or you can do the math on paper, .80 x 200. Using this formula, you can find your answer.

alisha [4.7K]4 years ago
5 0

Answer: $160

Step-by-step explanation:

80%is the same thing as \frac{80}{100}

Also , since we are using equivalent ratio , we will look for a way to write 200 in order to have equivalent of 100. That is 200 is the same as 100 x 2

Therefore : 80% of a 200 is the same

\frac{80}{100} x 100 x 2

which is the same as 80 x 2

$160

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Answer:

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Step-by-step explanation:

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3 years ago
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Blizzard [7]

Answer:

Correct option is (a). 60.391 and 101.879; because the test statistic is in a critical region, the test rejects the null hypothesis.

Step-by-step explanation:

A Chi-square test for population variance is used to perform this test.

The standard deviation is, 2.0 minutes.

Then the variance is, 4.0 minutes.

The hypothesis for this test is:

<em>H₀</em>: The population variance of all commute times is equal to 4.0 minutes, i.e. <em>σ² </em>= 4.

<em>Hₐ</em>: The population variance of all commute times is not equal to 4.0 minutes, i.e. <em>σ² </em>≠ 4.

The test statistic is:

\chi^{2}_{calc.}=\frac{(n-1)s^{2}}{\sigma^{2}}

The critical region of this test is defined as:

Reject <em>H₀</em> if \chi^{2}_{calc.} or \chi^{2}_{calc.}>\chi^{2}_{(1-\alpha /2), (n-1)}.

The degrees of freedom is:

n-1=81-1=80

Compute the critical from a Chi-square table.

\chi^{2}_{\alpha /2, (n-1)}=\chi^{2}_{0.05, 80}=101.879\\\chi^{2}_{(1-\alpha /2), (n-1)}=\chi^{2}_{0.95, 80}=60.391\\

The test statistic value is, \chi^{2}_{calc.}=105.8.

\chi^{2}_{calc.}=105.8 > \chi^{2}_{0.05, 80}=101.879

The null hypothesis is rejected because the test statistic is in the critical region.

Thus, the correct option is (a).

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Havent done this in years but i think it would just be 12
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