The following data represent the birth weights (in grams) of babies born in 2007, along with the period of gestation.

(a) What is the probability that a randomly selected baby born in 2007 was postterm?
(b) What is the probability that a randomly selected baby born in 2007 weighed 3000 to 3999 grams?
(c) What is the probability that a randomly selected baby born in 2007 weighed 3000 to 3999 grams and was postterm?
(d) What is the probability that a randomly selected baby born in 2007 weighed 3000 to 3999 grams or was postterm?
(e) What is the probability that a randomly selected baby born in 2007 weighed less than 1000 grams and was postterm? Is this event impossible?
(f ) What is the probability that a randomly selected baby born in 2007 weighed 3000 to 3999 grams, given the baby was postterm?
(g) Are the events €œpostterm baby€ and €œweighs 3000 to 3999 grams€ independent? Why?

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Period of Gestation Birth Weight Preterm Term Postterm Total (grams) Less than 1000 1000-1999 2000-2999 3000-3999 4000-4999 Over 5000 Total 31,267 1,082 101,548 263,667 713,797 39,212 1,016,676 152,073 2,498,255 175,221 2,825.549 325,782 4,518 544,997 3,518,204 242,139 4,305,340 30,985 88,962 251 31 11,504 9,107 203 290,478 26,197 3,919 396