Based on the data of the Center for Health Statistics, the 2005 birth rates in 50 states are grouped in the following frequency table.

Birth rate (per thousand) 10–12 12–14 14–16 No. of states 7 23 16 Birth rate (per thousand) 16–18 18 and over Total No. of states 3 1 50 (Endpoint convention: Lower point is included, upper is not.)

If one state is selected at random, what is the probability that the birth rate there is:

(a) Under 16?

(b) Under 18 but not under 14?

(c) 16 or over?