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Naya [18.7K]
2 years ago
6

Find the standard deviation of the data, 12, 19, 9.

Mathematics
1 answer:
jek_recluse [69]2 years ago
4 0

Answer:

4.19

Step-by-step explanation:

Find the mean:

\text{Mean}=\frac{12+19+9}{3}=\frac{40}{3}

Find the standard deviation:

\text{Standard Deviation}=\sqrt{\frac{(12-\frac{40}{3})^2+(19-\frac{40}{3})^2+(9-\frac{40}{3})^2}{3}}=\sqrt{\frac{158}{9}}\approx4.19

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A little difficult question for me, it is multiple choice answer but my teacher taught this before the break. If anyone could he
Sever21 [200]
<h3>Answer: Choice D</h3>

Divide both sides of the first equation by 7, then add the result to the second equation

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

Explanation:

We can multiply both sides of an equation by the same number and the equation will be equivalent to the original.

For example, if we had  x = 5, then we could get 2x = 10 after multiplying both sides by 2. The reason they are equivalent equations is because the same x value is the solution for both equations.

We can also divide both sides of an equation by the same number and the two equations would be equivalent. We can go from 2x = 10 back to x = 5 when we divide both sides by 2.

----------

If we divide both sides of 7x - 21y = 14 by 7, then we end up with x - 3y = 2. Simply divide each term (7x,  -21y, and 14) by 7.

Because 7x-21y=14 and x-3y=2 are equivalent, this means we can replace the "7x-21y=14" with "x-3y=2"

--------

The new system would be

x-3y = 2

2x+3y = 11

From here you add straight down. Doing so will have the y terms add to -3y+3y = 0y = 0. After this point the y terms are eliminated and you can solve for x just like with any other equation of one variable.

7 0
3 years ago
Aaron wants to buy 2 concert tickets that cost $25.50 each. Aaron's grandfather pays him $4.25 an hour to rake leaves. How many
alexandr402 [8]

You are going to times 25.50 together and that's 51 so then you are going to divide 51.00 by 4.25 and that's 12


So the answer is 12 

8 0
3 years ago
Read 2 more answers
Make a the subject of the formula<br><br> T=a-2
den301095 [7]
Either a = - 2/T or a = t + 2
3 0
3 years ago
Read 2 more answers
3.1 Q19
IgorC [24]
Let one length be x and the other be y

x + x + y + y = 440
2x + 2y = 440

Divide by 2 through ...
x + y = 220
y = 220 - x

Area = xy
Area = x(220 -x) = 220x - x^{2}

Given that that max length of x will be -b/2a
a = -1 b = 220
x = \frac{-220}{-2} = 110

x = 110
y = 220 - 110 = 110

Therefore max area = 110 x 110 = 12100 square yards


5 0
3 years ago
I need the formula for this graph
Nady [450]

Answer:

y=\frac{1}{12} x+\frac{1}{4}

Step-by-step explanation:

3 0
2 years ago
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