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pochemuha
3 years ago
15

I STILL HAVE POINTS NOT STOPPING

Mathematics
2 answers:
Serggg [28]3 years ago
6 0

Answer:

Is there even an answer to this?

Step-by-step explanation:

Fittoniya [83]3 years ago
3 0

Answer:

I don't know what's happening, but thanks for free points. :)))

Step-by-step explanation:

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In a study of the stability of IQ scores, a large group of individuals is tested once at age 18 and again at age 35. The followi
Naddika [18.5K]

Answer:

112

Step-by-step explanation:

Given that in a study of the stability of IQ scores, a large group of individuals is tested once at age 18 and again at age 35.

Age 18: average score = 100, SD = 15

Age 35: average score = 100, SD = 15, r = 0.80

Let us obtain regression equation of y on x.

Let y be the scores at age 35 and x at age 18

Slope = r(s_y/s_x) = 0.8(\frac{15}{15} )=0.80

The line passes through (100,100) being average of x and y

Hence regression line would be

y-100=0.8(x-100)\\y = 0.8x+20

a) Here given that x =115

Hence y=0.80(115)+20\\=112

the average score at age 35 for all the individuals who scored 115 at age 18, would be 112.

b) Prediction also would be the same 112.

5 0
3 years ago
What is the rate of change <br> x y<br> -2 -6<br> -1 -3<br> 0 0
Natalka [10]
So you subtract their integers by starting from the bottom then coming up to the top. And you just put the numbers in your calculator. Once you’ve got your answer for X and Y, you multiply them both. Which will give you -9/3. Next you divide -9 by 3 and 3 divided by 3. Which will give you -3/1 and just rewrite it as -3. I don’t know if this helps but I hope it does :).
5 0
3 years ago
What would be the steps​
DedPeter [7]

2- 12.5%

The hours between 12-8 is a total of 8 hours

6 to 8 is a total of 2 hours

2/8 is 25 percent but there are two days on the weekend so therefore it’s a 50 50 Chance to play on Sunday so divide 25 in half and you get 12.5 %

3 0
2 years ago
Solve for x and not to scale
sergij07 [2.7K]

Answer:

x = 90

Step-by-step explanation:

Since the triangles are similar then the ratios of corresponding sides are in proportion, that is

\frac{BC}{NE} = \frac{AB}{TN} , substitute values

\frac{3}{27} = \frac{10}{x} ( cross- multiply )

3x = 270 ( divide both sides by 3 )

x = 90

6 0
3 years ago
At a country concert, the ratio of the number of boys to the number of girls is 2:7. If there are 250 more girls than boys, how
zvonat [6]
Boys : Girls = 2:7
let the no. of boys be x
so no of girls = 250+x
so, x:(250+x) = 2:7
x/(250+x) = 2/7
7x = 500+2x
7x-2x = 500
x = 500/5 =100

8 0
3 years ago
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