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Ymorist [56]
1 year ago
15

Find the coordinates of p that represent the weighted average of each set of points based on the given conditions

Mathematics
1 answer:
mote1985 [20]1 year ago
5 0

The coordinates that represent the weighted mean of points are given as follows:

(-1.17, -1.58).

<h3>What is the weighted mean?</h3>

The weighted mean is given by the <u>sum of all elements in a data-set multiplied by it's weight, divided by the sum of the weights</u>.

For this problem, the points and weights are given as follows:

  • X(2,0) with a weight of 1.
  • U(-8,-5) with a weight of 2.
  • W(-3, -2.5) with a weight of 4.
  • V(-6,-4) with a weight of 2.
  • Z(8,3) with a weight of 3.

The x-coordinate of the mean is given as follows:

x = (2 x 1 - 8 x 2 - 3 x 4 - 6 x 2 + 8 x 3)/(1 + 2 + 4 + 2 + 3) = -1.17.

The y-coordinate of the mean is given as follows:

x = (0 x 1 - 5 x 2 - 2.5 x 4 - 4 x 2 + 3 x 3)/(1 + 2 + 4 + 2 + 3) = -1.58.

More can be learned about the weighted mean at brainly.com/question/18554478

#SPJ1

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Solve the following system of equations for a and for b:
viktelen [127]

Answer:

a=3\\b=1

Step-by-step explanation:

9a+3b=30\\8a+4b=28

Let's solve the second equation for a to later on replace it in the first equation.

8a+4b=28\\8a=28-4b\\a=\frac{28-4b}{8}

Now plug this into the first equation.

9a+3b=30\\9(\frac{28-4b}{8})+3b=30

Distribute the 9

(\frac{252-36b}{8}) +3b=30

Break down the fraction.

\frac{252}{8}-\frac{36b}{8}+3b=30

Simplify.

\frac{63}{2}-\frac{9}{2}b+3b=30

Subtract \frac{63}{2}

-\frac{9}{2}b+3b=30-\frac{63}{2}

Combine like terms.

\frac{-9+2*3}{2}b=\frac{30*2-63}{2}

\frac{-9+6}{2}b=\frac{60-63}{2}

\frac{-3}{2}b=\frac{-3}{2}

Muliply by the reciprocal or inverted fraction next to b.

(-\frac{2}{3})(-\frac{3}{2}) b=-\frac{3}{2}(-\frac{2}{3})

b=1

Now plug this value into any of the equations to find the value of a.

8a+4b=28\\8a+4(1)=28\\8a+4=28\\8a=28-4\\8a=24\\a=\frac{24}{8}\\ a=3

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4 years ago
In a residual plot against x that does NOT suggest we should challenge the assumptions of our regression model, we would expect
Snowcat [4.5K]

Answer:

In a residual plot against x that does NOT suggest we should challenge the assumptions of our regression model, we would expect to see a _____.

c. horizontal band of points centered near 0

Step-by-step explanation:

This residual graph or plot shows the residual values (or the difference between the observed y-value (from scatter plot) and the predicted y-value (from regression equation line) on the vertical axis and displays the independent variable on the horizontal axis.  A linear regression model becomes appropriate for a dataset when the points are randomly dispersed around the horizontal axis near 0; otherwise, a nonlinear model becomes more appropriate.

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Answer:

C and D

Step-by-step explanation:

2x^2  + 7x + 6

(2x + 3)(x+2)

x = -3/2 = -1.5

x = -2

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3 years ago
Which of the following is equivalent to (a^1/2*b^1/3)^1/2?
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Answer:

a^1/4*b^1/6

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