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SIZIF [17.4K]
2 years ago
15

Miranda conducted a survey on how many hours per day students spend surfing the internet versus how many pets they have. She sur

veyed ten of her classmates and recorded the data in the scatter plot below.
Use technology to determine which equation best models the data in the scatter plot.
A.
y = -0.4x + 6.3
B.
y = -7.4x + 0.7
C.
y = -0.7x + 7.4
D.
y = -6.3x + 0.4

Mathematics
1 answer:
anzhelika [568]2 years ago
7 0

Answer:

Step-by-step explanation:

a

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Find the standard deviation for the group of data items 4, 4, 4, 4, 6, 8 The standard deviation is (Simplify your answer. Round
marysya [2.9K]

Answer: 1.53

Step-by-step explanation:

The given data : 4, 4, 4, 4, 6, 8

Number of data values : n= 6

The mean value of the given data will be  :-

\overline{x}=\dfrac{\sum_{i=1}^{6}x_i}{n}\\\\\Rightarrow\ \overline{x}=\dfrac{30}{6}=5

The formula to find standard deviation:_

\sqrt{\dfrac{\sum(x-\overline{x})^2}{n}]

Now,

\sum_{i=1}^{6}(x_i-\overline{x})^2=(-1)^2+(-1)^2+(-1)^2+(-1)^2+(1)^2+(3)^2\\\\=1+1+1+1+1+9=14

The standard deviation will be :-

\sigma=\sqrt{\dfrac{14}{6}}\approx1.53

5 0
3 years ago
Which expression is represented on the number line? ​
frozen [14]

Answer:

b

Step-by-step explanation:

because it is -2 four times and if you do -2 ×4 you get -8. hope thid helped

5 0
2 years ago
What is the midpoint of CD?<br> • (1/2,-5/2)<br> •(1,-5/2)<br> •(1/2,-3/2)<br> •(1,-3/2)
polet [3.4K]

Answer:

(1/2,-5/2)

Step-by-step explanation:

\frac{ - 3 + 4 }{2}  = \frac{1}{2}  \\   \frac{ - 4 +  - 1}{2}  =   \frac{ - 5}{2}

7 0
2 years ago
Read 2 more answers
Problem ID: PRABJVTY
aksik [14]

Answer:

I'm confused too I'm sorry

3 0
3 years ago
Please solve quickly ​
solong [7]

Answer:

24.9π

Step-by-step explanation:

Curcle Area=πR^2

A= πR^2 × 140°/360°

A= π×8^2 × 0.389 =~ 78.15

4 0
1 year ago
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