The graph of the discrete probability to the right represents the number of live births by a mother 41 to 46 years old who had a live birth in 2015. 0 1 2 3 4 5 6 7 8 0.00 0.05 0.10 0.15 0.20 0.25 0.30 Number of Live Births Probability A histogram with a horizontal axis labeled “Child” from 1 to 8 in intervals of 1 and a vertical axis labeled "Probability" from 0 to 0.30 in intervals of 0.05 has eight vertical bars of width 1, centered along the horizontal axis labels, with labeled heights. The heights of the vertical bars are as follows, with the horizontal axis label listed first and the bar height listed second: 1, 0.233; 2, 0.256; 3, 0.171; 4, 0.112; 5, 0.106; 6, 0.031; 7, 0.036; 8, 0.055.

(a) What is the probability that a randomly selected 41- to 46-year-old mother who had a live birth in 2015 has had her fourth live birth?(Type an integer or a decimal.) 

(b) What is the probability that a randomly selected 41- to 46-year-old mother who had a live birth in 2015 has had her fourth or fifth live birth? (Type an integer or a decimal.) 

(c) What is the probability that a randomly selected 41- to 46-year-old mother who had a live birth in 2015 has had her sixth or more live birth? (Type an integer or adecimal.) 

(d) If a 41- to 46-year-old mother who had a live birth in 2015 is randomly selected, how many live births would you expect the mother to have had? (Round to one decimal place asneeded.)