I. The distribution is skewed left II. The interquartile range is 6

III. The median is 22

Identify the true statement or statements.

Let x have probability generating function gx (s) and let un generating function u(s) of the sequence uo, u1, satisfies p(x > n). show that the (1- s)u(s) = 1 - gx(s), whenever the series defining these generating functions converge.