Question

When the outliers are removed, how does the mean change?

dot plot with 1 on 50, 1 on 76, 1 on 78, 2 on 79, 1 on 80, 1 on 81, 2 on 82, 1 on 83

The mean decreases by 3.
The mean increases by 2.
The mean increases by 3.
There are no outliers.

Answer 1

@Nnesha

Answer 2

For each dot, write down its number, add them up and divide by the number of dots.
what do you get ?

Answer 3

ok hold on

Answer 4

75?

Answer 5

did you want me to just do the numbers that had a dot on top of them or every single number?

Answer 6

the places with 2 dots means you have that number twice.
the numbers are
50, 76, 78, 79,79, etc

Answer 7

First, what do you get for the total?
then what do you get after dividing by the number of dots?

Answer 8

wait can you tell me what numbers i am using?

Answer 9

everywhere you see one dot, use that number
if you see two dots, use that number twice
you will have a number for every dot (10 numbers)

Answer 10

i am not using 52 54 56 58 e.t.c beuase they do not haeve dots on top go them . I am doing the ones that have dots on top of the numbers

Answer 11

yes

Answer 12

77.100 (about)

Answer 13

i used the wplphram calclc

Answer 14

http://www.wolframalpha.com/input/?i=mean+50+76+78+79+79+80+81+82+82+84

Answer 15

it should add up to 770
and divide by 10 to get 77
that is the average (the mean) of the 10 numbers.

Now add up all the numbers except for the 50 (50 is the "outlier" because it lies far away from the other numbers)

I would do 770-50
and then divide by 9 (the number of values we have after tossing the 50)

Answer 16

ok let me do that hold on

Answer 17

80

Answer 18

so the mean changed from 77 to 80

I got 720/9 = 80 for the second mean

Answer 19

yeah it was right

Answer 20

so you go from 77 to 80
how did the mean change?

Answer 21

2

Answer 22

no omg i am not think 3

Answer 23

"The mean increases by 3"

Answer 24

yes 80-77 = 3
or
77+3 = 80

increases by 3