Here are 10 test scores: 50, 74, 76, 77, 78, 79, 80, 80, 82, 84. The mean of these scores is 76.

How does removing the outlier 50 affect the mean?

A.
The set has 50 as an outlier and removing it decreases the mean by about 2.

B.
The set has 50 as an outlier and removing it increases the mean by about 3.

C.
The set has 50 as an outlier and removing it decreases the mean by about 6.

@youngstudier

Question

Here are 10 test scores: 50, 74, 76, 77, 78, 79, 80, 80, 82, 84. The mean of these scores is 76. 
 
How does removing the outlier 50 affect the mean?
 
 A.
The set has 50 as an outlier and removing it decreases the mean by about 2.
 
 B.
The set has 50 as an outlier and removing it increases the mean by about 3.
 
 C.
The set has 50 as an outlier and removing it decreases the mean by about 6.


@youngstudier

anonymous · Answer

B.

campbell_st · Answer

well its a simply task to find the mean of the scores without the outlier of 50... 

New mean = sum of the score/9

and then compare it

youngstudier · Answer

@Foxythepirate0984 , what do you think?

anonymous · Answer

All you have to do is add  74, 76, 77, 78, 79, 80, 80, 82, 84 together then divide by how many numbers so 9 then you get you mean and can answer your question :)