Question: This distribution of prime difference scores has:

Your answer: a negative skew and a mean below 0.
Correct answer: a postive skew and a mean above 0.

Explanation: The distribution showed below has a longer tail extending to the right than it does to the left. This means the skew is positive. Although the interval with a midpoint of -0.10 has the highest frequency count, the mean of the distribution is greater than 0.