# Question

The probability histogram on the following page represents the number of live births by a mother 50 to 54 years old who had a live birth in 2007.

(a) What is the probability that a randomly selected 50- to 54-year-old mother who had a live birth in 2007 has had her fourth live birth?

(b) What is the probability that a randomly selected 50- to 54-year-old mother who had a live birth in 2007 has had her fourth or ﬁfth live birth?

(c) What is the probability that a randomly selected 50- to 54-year-old mother who had a live birth in 2007 has had her sixth or more live birth?

(d) If a 50- to 54-year-old mother who had a live birth in 2007 is randomly selected, how many live births would you expect the mother to have had?

(a) What is the probability that a randomly selected 50- to 54-year-old mother who had a live birth in 2007 has had her fourth live birth?

(b) What is the probability that a randomly selected 50- to 54-year-old mother who had a live birth in 2007 has had her fourth or ﬁfth live birth?

(c) What is the probability that a randomly selected 50- to 54-year-old mother who had a live birth in 2007 has had her sixth or more live birth?

(d) If a 50- to 54-year-old mother who had a live birth in 2007 is randomly selected, how many live births would you expect the mother to have had?

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