The following data represent the number of live multiple-delivery births (three or more babies) in 2012 for women 15 to 54 years old.
Age Number of Multiple Births
15-19...................................................44
20-24..................................................404
25-29................................................1204
30-34................................................1872
35-39................................................1000
40-44..................................................332
45-54...................................................63
(a) Construct a probability model for number of multiple births.
(b) In the sample space of all multiple births, are multiple births for 15- to 19-year-old mothers unusual?
(c) In the sample space of all multiple births, are multiple births for 40- to 44-year-old mothers unusual?