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The percent distribution of live multiple-delivery births (three or more babies) in a particular year for women 15 to 54 years old is shown in the pie chart. Find each probability.
a. Randomly selecting a mother 30-39 years old
b. Randomly selecting a mother not 30-39 years old
c. Randomly selecting a mother less than 45 years old
d. Randomly selecting a mother at least 20 years old