Question

Ammonia plus organic nitrogen (mg/L) was measured in samples of precipitation, as given below.

What is the best number to represent the “average” of the ammonia plus organic nitrogen concentration? and why?

(Hint: Which observation might be considered an outlier? How does this affect the summary statistics used?)

Ammonia plus organic nitrogen (mg/L)

0.002

0.3

0.9

0.36

0.92

0.5

1.0

0.7

9.7

0.7

1.3

Answer 1