Question

Below are some of the scores on a math quiz given last week.

{81, 72, 73, 77, 45, 72}

What will happen to the mean of the quiz scores if the outlier is removed?
The mean will increase.
The mean will decrease.
The mean will not change.
There is not enough information given.

Answer 1

i think its b

Answer 2

@Pandora

Answer 3

Mean is just adding all numbers together then dividing by the number of numbers.

The outlier here is 45.

So we'd be taking 45 out.

Answer 4

So two things decrease here.

What will that do to the total?

Answer 5

make it go down

Answer 6

That's correct.

Answer 7

so b?

Answer 8

Yes, you're correct. :)