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2 years ago

Answer both question

Mathematics

1 answer:

Crank2 years ago

4 0

Answer:

5.)

15.36+x=32.11

15.36+x-15.36=32.11-15.36

x=32.11-15.36

x=16.75

6.)

-2(a-3b+c)

-2a+6b-2c

7.)

3a+15y-5a=-a+2(3-a)

-2a+15y= -a+6-2a

-2a+15y=-3a+6

-2a+15y+2a=-3a+6+2a

15y=-a+6

15y/15=-a+6/15

y=-a+6/15

I hope this is good enough:

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2 years ago

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Answer:

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In order to find the variance of the set of data we first need to calculate the mean of the set, which is given by:

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mean = (5 + 8 + 2 + 9 + 4)/5 = 5.6

We can now find the variance by applying the following formula:

$s^{2} = \frac{\sum_{(i=1)}^n(x_i - mean)^2}{n -1}$

So applying the data from the problem we have:

s² = [(5 - 5.6)² + (8 - 5.6)² + (2 - 5.6)² + (9 - 5.6)² + (4 - 5.6)²]/(5 - 1)

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2 years ago