The following data represent the birth weights (in grams) of babies born in 2013, along with the period of gestation.

(a) What is the probability that a randomly selected baby born in 2013 was postterm?
(b) What is the probability that a randomly selected baby born in 2013 weighed 3000-3999 grams?
(c) What is the probability that a randomly selected baby born in 2013 weighed 3000-3999 grams and was postterm?
(d) What is the probability that a randomly selected baby born in 2013 weighed 3000-3999 grams or was postterm?
(e) What is the probability that a randomly selected baby born in 2013 weighed less than 1000 grams and was postterm? Is this event impossible?
(f) What is the probability that a randomly selected baby born in 2013 weighed 3000-3999 grams, given the baby was postterm?
(g) Are the events "postterm baby" and "weighs 3000-3999 grams" independent? Why?

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Period of Gestation Birth Weight Preterm (grams) Term Postterm Total Less than 1000 27,096 179 26 27,301 10,502 1000–1999 78,690 1063 90,255 221,778 2000-2999 661,729 38,665 922,172 3000-3999 2,317,287 2,596,802 119,161 160,354 4000-4999 7390 275,733 24,538 307,661 Over 5000 220 4019 398 4637 Total 454,335 3,269,449 225,044 3,948,828