Question

Find the outlier in the data: 32, 40, 34, 31, 20, 36, 40, 31. How does the outlier affect the mean? If necessary, round to the nearest tenth.


20; lowers it by 1.9.

20; raises it by 1.9.

45; lowers it by 1.7.

45; raises it by 1.7.

Answer 1

if the mean is m = ∑x/8
then removing the outlier (20) makes the new mean
(8m-20)/7

Not sure just what your choices mean. There is no 45 in the data.