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arlik [135]
3 years ago
13

Ibuybook for $8,isell it for$ 3.25.How muchoflossdoimake ?​

Mathematics
2 answers:
Anuta_ua [19.1K]3 years ago
4 0

Answer:

Loss = $ 4.75

Step-by-step explanation:

Loss = cost price -selling price

You bought a book will be cost price and when u r selling it it will be selling price

loss = 8-3.25

      = 4.75

Loss = $ 4.75

Sauron [17]3 years ago
4 0

Answer:

4.75

Step-by-step explanation:

Subtract the two numbers:

8.00-3.25

doing the math you will get $4.75

So the money that wasn't made up for is, $4.75

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Step-by-step explanation:

Because it is

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Answer:

What do you need help with?

Step-by-step explanation:

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2 years ago
List the < from the largest to smallest for ABC
devlian [24]

Answer: B

Step-by-step explanation:

Since AB < AC < BC, it follows that \angle C < \angle B < \angle A

4 0
2 years ago
math problme After hearing of the national result that 44% of students engage in binge drinking (5 drinks at a sitting for men,
natali 33 [55]

Answer:

According to the result of the hypothesis test, there is no significant difference between the true population proportion of students who binge drink according to the results of the Professor's survey and the national standard of 0.44.

So, the Professor shouldn't be surprised by this result.

Step-by-step explanation:

- The known standard proportion of students for binge drinking is 44% = 0.44.

- In the Professor's random sample, 96 out of 244 students admitted to binge drinking in the past week.

- So, we need to check if the result of the random sample is in keeping with the known national standard.

For hypothesis testing, the first thing to define is the null and alternative hypothesis.

The null hypothesis plays the devil's advocate and usually takes the form of the opposite of the theory to be tested. It usually contains the signs =, ≤ and ≥ depending on the directions of the test.

While, the alternative hypothesis usually confirms the the theory being tested by the experimental setup. It usually contains the signs ≠, < and > depending on the directions of the test.

For this question, the null hypothesis is that there is no significant difference between the true population proportion of students who binge drink according to the results of the Professor's survey and the national standard of 0.44.

The alternative hypothesis will now be that there is significant difference between the true population proportion of students who binge drink according to the results of the Professor's survey and the national standard of 0.44.

Mathematically,

The null hypothesis is represented as

H₀: p = 0.44

The alternative hypothesis is given as

Hₐ: p ≠ 0.44

To do this test, we will use the t-distribution because no information on the population standard deviation is known

So, we compute the t-test statistic

t = (x - μ)/σₓ

x = sample proportion of the Professor's poll = (96/244) = 0.393

μ = p₀ = the national standard = 0.44

σₓ = standard error = √[p(1-p)/n]

where n = Sample size = 244

σₓ = √[0.393×0.607/244] = 0.0313

t = (0.393 - 0.44) ÷ 0.0313

t = -1.50

checking the tables for the p-value of this t-statistic

Degree of freedom = df = n - 1 = 244 - 1 = 243

Significance level = 0.05 (most tests are performed at 5% significance level)

The hypothesis test uses a two-tailed condition because we're testing in the two directions.

p-value (for t = -1.50, at 0.05 significance level, df = 243, with a two tailed condition) = 0.134913

The interpretation of p-values is that

When the (p-value > significance level), we fail to reject the null hypothesis and when the (p-value < significance level), we reject the null hypothesis and accept the alternative hypothesis.

So, for this question, significance level = 0.05

p-value = 0.134913

0.134913 > 0.05

Hence,

p-value > significance level

This means that we fail to reject the null hypothesis & say that there is not enough evidence to conclude that there is a significant difference between the true population proportion of students who binge drink according to the Professor's survey and the national standard.

That is, there is no significant difference between the true population proportion of students who binge drink according to the results of the Professor's survey and the national standard of 0.44.

Hope this Helps!!!

8 0
3 years ago
A monument casts a 40 ft shadow. Adam is 6 ft tall and casts a 5 foot shadow. How tall is the monument
OLga [1]
The answer is 48 feet (D).

Explanation:

To solve this, you must think of the monument and its shadow and Adam and his shadow as a triangle, the person/object being the vertical leg, the shadows being the horizontal leg, and a line connecting them being the hypotenuse.  Also, we can assume that these triangles are similar.  First, we can set the scale to be 40/5 (the two shadows set a scale because the triangles are similar).  Then, we can put x/6 (the actual things are similar, and the scale was established to be building/measurement).  Next, we can set the two fractions equal to each other (40/5 = x/6) and solve.  We can cross multiply to get 5x = 40 * 6.  That goes to  5x = 240.  Finally, we can divide by five on each side to get x = 48 feet (D).
3 0
3 years ago
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