Which of the values below is impossible for the descriptive measure in question?
Answer
r = 1.25
mean = -0.2
s = 3.4
both (a) and (b)
both (a) and (c)

Think this through:

First, I assume by "r" you mean correlation coefficient. Take a look in your text book and it should tell you what the possible range of values for r is.

You have a mean that's a negative number. Is that a problem, or not?

You have a standard deviation s that's a positive number - do you see any problems with that?

Now post back and tell us what you think the right answer is.