The data on the table represent the number of live multiple delivery births (three or more babies) in a particular year for women 15 to 54 years old. Use the data to determine the following. (Round all answers three decimals)
a. Determine the probability that a randomly selected multiple birth for women 15-54 years old involved a mother 30 to 39 years old.
b. Determine the probability that a randomly selected multiple birth for women 15-54 years old involved a mother who was not 30 to 39 years old.
c. Determine the probability that a randomly selected multiple birth women 15-54 years old involved a mother who as less than 45 years old.
d. Determine the probability that a randomly selected multiple birth for women 15-54 years old involved a mother who as at least 20 years old.
Age Number of Multiple Births

15-19 91
20-24 513
25-29 1630
30-34 2839
35-39 1841
40-44 379
45-54 118