Birth rates in the 50 states, collected in a recent year by the Center for Health Statistics, are grouped into the following frequency table.

Endpoint convention: Lower endpoint is included, upper endpoint is not.

If one state is selected at random, what is the probability that the birth rate there is:
(a) Under 12.3?
(b) Under 14.3 but not under 10.3?
(c) 13.3 or over?

Birth rate (per thousand) No. of states Birth rate (per thousand) No. of states 9.3-10.3 5 12.3-13.3 20 10.3-11.3 5 11.3-12.3 10 13.3-14.3 14.3 and over 5 5