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43 votes
43 votes
The outlier is to be removed from this set of values.

How will the mean be affected?
8, 7, 12, 15, -2, -3, 80, 7,9
- A The mean is increased by about 1.85.
- ® The mean is decreased by about 6.63.
© The mean is decreased by about 8.15.
D The mean is decreased by about 8.89

User Mamu
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1 Answer

7 votes
7 votes

Answer:

C) The mean is decreased by about 8.15

Explanation:

To find mean we add up all data values to get the sum, count the number of values in the data set, and divide the sum by the count. So I first added up all the values including the outlier, which I found 80 to be the outlier. I got 133 once I added all the values, I then counted there to be 9 values so I did 133/9 to get 14.778. Now we find the mean without the outlier, 80. So again we add all the values to get 53 and now that the outlier is gone there is on eless value so 53/8 which equals 6.625. So 14.8 - 6.625 = 8.175 which is closest to 8.15. Hope this helps!

User Ara Pulido
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