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Mathematics 19 Online
OpenStudy (rainbow_rocks03):

For the data in the table, the mean score is 15 and the median score is 14. How are the mean and median affected when the outlier 42 is added to the data? Table titled Points Scored with data in the first and only row being 12, 13, 14, 19, 16, 14, 11, and 21. A. The mean and median are not affected. B. The mean and median both increase by 3. C. The mean increases by 3, but the median stays the same. D. The median increases by 3, but the mean stays the same. http://static.k12.com/calms_media/media/1417500_1418000/1417708/1/e2741c82049d3fcbc8867f3110e1da2a

OpenStudy (rainbow_rocks03):

Click the second link cause the first one didn't work

OpenStudy (rainbow_rocks03):

also NO DIRECT ANSWERS

OpenStudy (rainbow_rocks03):

Can you help?

OpenStudy (rainbow_rocks03):

@amistre64

OpenStudy (rainbow_rocks03):

IDUT=I Don't Understand This

OpenStudy (anonymous):

idk

OpenStudy (amistre64):

the first thing to help us out is to order it, and how do we determine the value of a mean and median?

OpenStudy (rainbow_rocks03):

we add all the numbers up?

OpenStudy (amistre64):

also, consider that outliers affect the mean .... so 2 options are just not valid to start with

OpenStudy (amistre64):

adding up, and dividing is how we find the mean and just picking the number i the middle of an ordered set is how we can determine the median

OpenStudy (rainbow_rocks03):

IDK what the middle # is.

OpenStudy (amistre64):

what does the ordered set look like?

OpenStudy (amistre64):

first off, is the mean going to be affected? lets narrow our options

OpenStudy (rainbow_rocks03):

BRb

OpenStudy (rainbow_rocks03):

ok im back

OpenStudy (rainbow_rocks03):

NO DIRECT ANSWERS

OpenStudy (rainbow_rocks03):

I always say that when I put a board DON'T YALL FOLLOW DIRECTIONS?

OpenStudy (amistre64):

focus on the question, not on the spam :)

OpenStudy (anonymous):

it didnt say ....

OpenStudy (rainbow_rocks03):

ok

OpenStudy (amistre64):

will 42 affect the mean?

OpenStudy (rainbow_rocks03):

yes?

OpenStudy (amistre64):

it should yes. so that narrows our options

OpenStudy (amistre64):

so the question is really, how does it affect the median. wht is our ordered set?

OpenStudy (rainbow_rocks03):

IDK

OpenStudy (amistre64):

in elementary school grades they teach you how to determine if one number is bigger or smaller than another. .... just order the numbers from smallest to biggest.

OpenStudy (rainbow_rocks03):

11 , 12 , 13 , 14 , 14 , 16 , 19 , 21

OpenStudy (amistre64):

good, now we can find the middle

OpenStudy (rainbow_rocks03):

14?

OpenStudy (amistre64):

yep, now adding on the 42, what does the middle become? 11 , 12 , 13 , 14 , 14 , 16 , 19 , 21, 42

OpenStudy (rainbow_rocks03):

14 still

OpenStudy (amistre64):

11 , 12 , 13 , 14 , 14 , 16 , 19 , 21, 42 >>>>>>>>>>< <<<<<<<<<< yep, still 14 so the median doesnt change, but the mean does

OpenStudy (rainbow_rocks03):

So my answer is D

OpenStudy (amistre64):

lets read them A. The mean and median are not affected. ^^^^^ ^^^^^^^^^ false B. The mean and median both increase by 3. ^^^^^^^^^^^ false C. The mean increases by 3, but the median stays the same. ^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^ true enough D. The median increases by 3, but the mean stays the same. ^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^ false

OpenStudy (rainbow_rocks03):

oops that was what I meant

OpenStudy (rainbow_rocks03):

I meant to say C

OpenStudy (rainbow_rocks03):

TY for the help

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