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GalinKa [24]
2 years ago
15

What is the variance of the following data? If necessary, round your answer to two decimal places.12, 13, 8, 13, 9, 11, 12, 9, 1

1
Mathematics
1 answer:
siniylev [52]2 years ago
8 0
To find the variance, 1. Find the arithmetic mean (average) 2. Find the distance of each number from the mean (x-the mean=?) 3. Square each number 4. Add up all of the squares 5. Divide the final sum by the original mean. 
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-k/3 = 9<br> answer = ??
taurus [48]

Answer:

-k=9×3

-k=27

God luck friend

7 0
2 years ago
Read 2 more answers
What is the total surface area
Stels [109]

We have two right triangles and three different rectangles.

The formula of an area of a right triangle:

A_T=\dfrac{1}{2}l_1l_2

l₁, l₂ - legs

We have l₁ = 20cm and l₂ = 21cm. Substitute:

A_T=\dfrac{1}{2}(20)(21)=(10)(21)=210\ cm^2

The formula of an area of a rectangle:

A_R=lw

l - length

w - width

We have:

rectangle #1: l = 22cm, w = 29cm

A_{R1}=(22)(29)=638\ cm^2

rectangle #2: l = 22cm, w = 21cm

A_{R2}=(22)(21)=462\ cm^2

rectangle #3: l = 22cm, w = 20cm

A_{R3}=(22)(20)=440\ cm^2

The total Surface Area of the triangular prism:

S.A.=2A_T+A_{R1}+A_{R2}+A_{R3}\\\\S.A.=2\cdot210+638+462+440=1960\ cm^2

3 0
2 years ago
R Which statement is true regarding the diagram of circle P? S P. Х у N The sum of y and z must be 2x. The sum of y and z must b
sveta [45]

Answer

The sum of y and z must be 1/2 x

Step-by-step explanation:

You'll see

5 0
3 years ago
3. Write equations of two lines, one with an x-intercept but no y-intercept and one with a y-intercept but
Vesnalui [34]
X = 50 (Is parallel to the y-axis so there is no intersection point)
Y= 40 (Is parallel to the x-axis so there is no intersection point)
Both no intercept with the other
6 0
3 years ago
Rationalize the denominator of the fraction: √5/√8 - √3
Lana71 [14]

Answer:

Step-by-step explanation:

Remark

The editor must have brackets put around the denominator when there are 2 terms.

That means I think the question is (√5) / (√8 - √3). If this is incorrect, leave a note.

To rationalize the denominator, you must multiply numerator and denominator by the conjugate  (√8 + √3).

Solution

√5 *  (√8 - √3) /  ( (√8 - √3) *  (√8 + √3)  )  

I don't think there is any point in removing the brackets in the numerator. Just leave it.

The denominator is a different matter.

denominator = ( (√8 - √3) *  (√8 + √3)  )

√8 * √8 = 8

√8 * √3 = √24

- √3 * √8 = - √24

-√3 * √3 = - 3

Take a close look at the 2 middle terms. They cancel out because one of them is plus and the other minus.

What you are left with is 8 - 3 = 5

So the final answer is

√5 *  (√8 - √3)

=============

5

6 0
2 years ago
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