7.1

shadenorm(mu=3400, sig=505, between=c(4410, 6000),col = "blue",dens = 150)

  1. (i)the proportion of birth weights of full-term babies more than 4410 grams is 0.0228 (ii)the probability that a randomly selected birth weights of full-term babies more than 4410 grams is 0.0228
  1. the proportion of human pregnancies that lasts more than 280 days is 0.1908
  2. the probability that a randomly selected human pregnancies that lasts more than 280 days is 0.1908
  1. the proportion of human pregnancies that lasts between 230 and 260 days is 0.3416
  2. the probability that a randomly selected human pregnancies that lasts between 230 and 260 days is 0.3416