When the outliers are removed, how does the mean change?
dot plot with 1 on 18, 2 on 38, 1 on 40, 3 on 44, 1 on 46, 1 on 48
The mean decreases by 2.75.
The mean increases by 2.75.
The mean increases by 3.25.
There are no outliers.

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- anonymous

- chestercat

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- anonymous

i know the mean increases

- anonymous

by 3.25

- anonymous

is it?

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## More answers

- anonymous

i think so

- anonymous

- misssunshinexxoxo

I'll check this

- anonymous

thank you

- misssunshinexxoxo

Pretty sure by 3.25; I'll have a friend check @jim_thompson5910

- anonymous

thats what i thought

- phi

First , figure out
1 on 18, 2 on 38, 1 on 40, 3 on 44, 1 on 46, 1 on 48
18+2*38+40+3*44+46+48
and then divide by 1+2+1+3+1+1
that is the original mean
then figure out
2*38+40+3*44+46+48
and divide by 2+1+3+1+1
that is the new mean

- anonymous

its 42 and 1/3

- anonymous

witch simplifys to 3.25

- phi

What did you get for
18+2*38+40+3*44+46+48
?

- anonymous

360

- phi

and what do you get for
1+2+1+3+1+1
?

- anonymous

9

- phi

the average is the sum of all the numbers (i.e. 360) divided by the number of numbers (i.e. 9)
so the first mean is 360/9 = what ?

- anonymous

40

- phi

now we "toss out the outlier"
which is the number that seems "far away" from the others.
in this case, the 18 seems far away
so now we add up all the numbers 360 take away 18
we get 360-18 = 342
and instead of 9 numbers, we now have 8 numbers.
the new mean is 342/8 = what ?

- anonymous

42.75

- phi

so old mean was 40, new mean is 42.75
the new mean is bigger by how much ?

- anonymous

2.75

- phi

and that is choice B

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