Adisadvantage of using an arithmetic mean to summarize a set of data is that select one: a. the arithmetic mean sometimes has two values b. it can be used for interval and ratio data c. it is always different from the median d. it can be biased by one or two extremely small or large values

d. It can be biased by one or two extremely small or large values

Step-by-step explanation:

Specially in a small sample, a single measure can cause a large difference.

For example, you are selling yourself as a tutor, you have five students. 4 of them got good grades, but the other one got 0. The arithmetic mean is not going to be kind to your averages, in virtue of the outlier.

So the correct answer is:

d. It can be biased by one or two extremely small or large values