## anonymous one year ago Here are 10 test scores: 30, 74, 76, 77, 78, 79, 80, 80, 82, 84. The mean of these numbers are 74. Does this set have an outlier and, if so, how does removing it affect the mean? A. The set has 30 as an out outlier, and removing it increases by about 5. B. The data has no outliers. C. The set has 30 as an outlier and removing it decreases the mean by about 5. D. The set has 30 as an outlier and removing it decreases the mean by about 10.

1. anonymous

@Lyralei @mathscience4ever @jordanawest22 @Slacker @sleepyjess @jane11509

2. anonymous

@Ghostedly @greenleaf1 @gaba

3. jane11509

I'm not sure :/

4. anonymous

30 is the outlier. what's the mean after you remove it?

5. anonymous

@AriPotta i'm not sure

6. jane11509

7. jane11509

I think the mean would be 78.8

8. anonymous

giving her the answer isn't helping her

9. jane11509

Sorry The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other words it is the sum divided by the count. this is how you find the mean

10. anonymous

$\frac{ 74+ 76+77+ 78+79+80+80+82+84 }{ 9 }=mean$

11. anonymous

Ok thank you @jane11509

12. jane11509

You're welcome :)

13. jane11509

Basically add all the numbers together and there are 9 minbers so divide the sum by 9 and BAM you have it :)

14. anonymous

Thank you too @AriPotta

15. anonymous

no problemo