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3 years ago

Justify x over 3 minus 7 equals 11

Mathematics

1 answer:

drek231 [11]3 years ago

4 0

Answer:

54/3-7=11

Step-by-step explanation:

x/3-7=11

+7 +7

(3)x/3=18(3)

x=54

Check

54/3-7=11

18-7=11

11=11

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Gabriel is making a mixture of compost and soil to use for a special plant. He wants his final mixture to be 2 parts compost to

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2parts compost and 10pats potting soil
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3 years ago

A high school runs a survey asking students if they participate in sports. The results are found below. Run an independence test

Sveta_85 [38]

Answer:

It can be concluded that participation in sports is dependent on grade level.

Step-by-step explanation:

In this case a Chi-square independence test for the data is to be performed at α = 0.01.

The hypothesis can be defined as follows:

H₀: The participation in sports is independent of grade level.

Hₐ: The participation in sports is dependent of grade level.

The data provided is:

Freshmen Sophomores Juniors Seniors

Yes 75 88 55 42

No 30 28 38 40

The formula to compute the expected frequencies is:

$E_{i}=\frac{i^{th}\ \text{Row Total}\ \times\ i^{th}\ \text{Column Total}}{N}$

The Chi-square statistic is:

$\chi^{2}=\sum {\frac{(O_{i}-E_{i})^{2}}{E_{i}}}$

Consider the Excel file attached below.

The value of Chi-square statistic is 16.244.

The degrees of freedom of the test are:

$\text{df}=(r-1)(c-1)$

$=(4-1)(2-1)\\=3\times 1\\=3$

Compute the p-value of the test as follows:

$p-value=P(\chi^{2}_{df}$

$=P(\chi^{2}_{3}$

*Use a Chi-square table.

p-value = 0.001 < α = 0.01

The null hypothesis will be rejected at 1% level of significance.

Thus, it can be concluded that participation in sports is dependent on grade level.

4 0

4 years ago

Is it true that a smaller standard deviation means the data set tended to cluster around the mean?

mel-nik [20]

Yes it is true that a small deviation means the data set tended to cluster around the mean .

7 0

4 years ago

I have been stuck on the problem for so long. please help me:

Xelga [282]

Answer:

D-2

Step-by-step explanation:

You can use elimination to get the value of y. Move numbers to one side and x and ys to the other side. To use elimination, multiply the first equation with 2. You will get 2x+2y=24. add it with the equation below. y will be eliminated and you will get the value of x. X=10. Plug in x and get the y value. Y=2

6 0

3 years ago

The official height to width ratio of the United States flag is 1:1.9 If a United States flag is 6 feet high, how wide is it?

pogonyaev

Answer:

11.4 feet

Step-by-step explanation:

1/1.9 = h/w (h= height, w=width)

Solving for w, gives you the formula

w = (1.9)h

This means the width is 1.9 times the height.

Use the formula to find the width where the height is 6 feet.

h = 6

w = (1.9)(6) = 11.4

The width is 11.4 feet.

4 0

2 years ago