Answer:
A. 0.75
Step-by-step explanation:
The formula for the <em>correlation coefficient</em> r is
![r =\frac {n \sum{xy} - \sum{x}\sum{y}}{\sqrt{[n \sum{x^{2}}- (\sum{x})^{2}}][n \sum{y^{2}}- (\sum{y})^{2}]}](https://tex.z-dn.net/?f=r%20%3D%5Cfrac%20%7Bn%20%5Csum%7Bxy%7D%20-%20%5Csum%7Bx%7D%5Csum%7By%7D%7D%7B%5Csqrt%7B%5Bn%20%5Csum%7Bx%5E%7B2%7D%7D-%20%28%5Csum%7Bx%7D%29%5E%7B2%7D%7D%5D%5Bn%20%5Csum%7By%5E%7B2%7D%7D-%20%28%5Csum%7By%7D%29%5E%7B2%7D%5D%7D)
It's easier to use a statistical calculator, but this question probably expects you to do it by hand.
Let’s write a table for easy calculation.
<u> x y xy x² y² </u>
15 36 540 225 1296
13 22 286 169 484
12 6 72 144 36
<u>11 20 220 121 400
</u>
51 84 1118 659 2216
(Σx)² = 2601
(Σy)² = 7056
![r =\frac{4\times1118-51\times84}{\sqrt{[4\times659-2601][4\times2216-7056]}}](https://tex.z-dn.net/?f=r%20%3D%5Cfrac%7B4%5Ctimes1118-51%5Ctimes84%7D%7B%5Csqrt%7B%5B4%5Ctimes659-2601%5D%5B4%5Ctimes2216-7056%5D%7D%7D)
![r =\frac{4472-4284}{\sqrt{[2636-2601][8864-7056]}}](https://tex.z-dn.net/?f=r%20%3D%5Cfrac%7B4472-4284%7D%7B%5Csqrt%7B%5B2636-2601%5D%5B8864-7056%5D%7D%7D)
r = 0.747
The graph below shows that there is a poor correlation among the points.
Answer:
300 calories
Explanation:
- perimeter of circle : 2 π r
Here radius:
perimeter of track = 2 π r = 2 (3.14) (75) = 471 ft
total laps ran:
So calories burnt:
Answer:
The second one
Step-by-step explanation:
I believe this because congruent means same in she and SIZE and the second one is not the same is size
Harry would earn total money equal to $32.50 babysitting.
Since Harry charges 50% more for each additional hour as he did for the previous hour, then
he charges 1.5 or 3/2 times as much as he did for the previous hour.
<h3>What is the charge?</h3>
Term Definition Money charge refers to a special expense entry and allows an administrator to track changes in a project's billing.
Harry charges $4 for the first hour.
Harry then charges
3/2 × $4 = $6 for the second hour.
Harry then charges 3
3/2 × $6 = $9 for the third hour.
Harry then charges 3
3/2 × $9 = $ 27/2 = $13.50 for the fourth hour.
Therefore, for 4 hours of babysitting
Harry would earn $4 + $6 + $9 + $13.50 = $32.50.
To learn more about the charge visit:
brainly.com/question/25922783
#SPJ1
Answer:
c. 12
Step-by-step explanation:
To isolate the variable, you need to cancel out whatever's on the same side of the variable by using the inverse of the operation.
Hope this helps!! Have an awesome day φ(*^0^)
