The following data represent the number of live multiple-delivery births (three or more babies) in 2002 for women 15 to 44 years old.
(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?