The probability density function f(x) of a random variable X that has a uniform distribution between a and b is

A) (b + a) /2
B) 1/b − 1/a
C) (a − b) /2
D) None of these choices.

When reporting descriptive data such as the mean,what additional information should also be reported that expresses how different the scores are in the distribution?

A) variability
B) outlier
C) skew
D) percentile