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Serjik [45]
4 years ago
9

Calculate population variance from population standard deviation

Mathematics
1 answer:
Tema [17]4 years ago
8 0
The standard deviatiion is the square root of the variance.
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Step-by-step explanation:

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9. 3x + 9y = 18<br> y = x + 2<br> Substitution method
777dan777 [17]

Answer:

x = 0

y = 2

Step-by-step explanation:

3x + 9y = 18 ---------eqn 1

y = x + 2---------eqn 2

Substitute eqn 2 into eqn 1, for the value of y

3x + 9( x + 2) = 18

3x + 9x + 18 = 18

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Divide both sides by 12 , to get the value of x.

12x/ 12 = 0/12

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y = x + 2

y = 0 +2

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Hint: to confirm the values

x = 0

y = 2

Let's take eqn 1 ,

3x + 9y = 18

3(0) + 9(2)

= 0 + 18

= 18

Correct

Let's take eqn 2

y = x + 2

Let's find y

y = 0 + 2

y = 2

Correct too

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