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.

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.

sammixboo · Answer

First, let's find the mean of the whole data set. Do you know how to find the mean?

anonymous · Answer

yes, the mean of the whole thing is 68.8

anonymous · Answer

@sammixboo

loser66 · Answer

the mean of the whole thing is 77
after removing the outliers, the mean is 79.625
hence, it increases 3

anonymous · Answer

ok, thanks
but how did you get 77?

loser66 · Answer

+ them up, divides by 10

anonymous · Answer

i got 688

loser66 · Answer

ok, let do it together
  50  <-- outlier
+76
+78
+79
+79
+80
+81
+82
+82
+83  <--- outlier
----------
770

loser66 · Answer

Take off outliers, it means 770 - 50 -83= 637
divided by 8, $637\div 8=79.625$

anonymous · Answer

oh, ok, thank you

loser66 · Answer

np