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Korvikt [17]
3 years ago
7

Which of the following choices is the standard deviation of the sample shown

Mathematics
1 answer:
frozen [14]3 years ago
7 0

Answer:

Mean = (19 + 20 + 21 + 22 + 23)/5 = 105/5 = 21

x    x - mean   (x - mean)^2

19     -2                4

20     -1                1

21      0                0

22      1                1

23      2                4

              Sum = 10

Step-by-step explanation:

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What is the factor of 3x2-9x-12?<br> pleaseeee help me guys !!
8090 [49]

Answer:3x² - 9x - 12 =

3(x² - 3x - 4) =

3(x² + x - 4x - 4) =

3(x(x+1)-4(x+1)) =

3(x+1)(x-4)

Step-by-step explanation:

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3 years ago
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Write the equation in slope intercept form: slope = -4; Y-intercept = (0,2)
tatuchka [14]

Answer:

y=-4x+2

Step-by-step explanation:

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Then

y=-4x+b

y=2  and x=0 at the intercept

thus

2=-4(0)+b

b=2

y=-4x+2



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Latasha $289 last week.she earned $213.73 this week how much more did latasha earn last week than this week
gizmo_the_mogwai [7]

Answer:

75.27

Step-by-step explanation:

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5 0
2 years ago
Find the value of x. Then find the angle measures of the polygon.
Inessa [10]

Answer:

The value of x is 43, the angle measures of the polygon are as follows:

top left = 129

top right = 86

bottom left = 55

bottom right = 90

Step-by-step explanation:

I calculated x with the following equation.

3x + 2x + (x + 12) + (2x + 4) = 360

Since all of the angles of this polygon add up to 360, I just put the angle measures on one side and 360 on the other. This is essentially like saying 360 = 360. Now all that is left to do is simplify and calculate the value of x.

5x + (x + 12) + (2x + 4) = 360

8x + 16 = 360

8x = 344

x = 43

Next, I plug the angle's into their expressions to solve for their individual values.

top left:

3x

3(43)

129

top right:

2x

2(43)

86

bottom left:

(x + 12)

(43 + 12)

55

bottom right:

(2x + 4)

[2(43) + 4]

(86 + 4)

90

All that is left to do is check our answer by adding up all the angles to see if they equal 360.

129 + 86 + 55 + 90

360

Because this equals 360, this answer is correct.

4 0
3 years ago
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