Question: The weight of newborn babies in Foxboro Hospital is normally distributed with a mean of 6.9 pounds and a standard deviation of 1.2 pounds.

(a) What is the probability that a newborn baby weight over 8 pounds?

(b) What is the 90th percentile for birth weight in this hospital?

(c) What is the probability that the average weight of 10 newborn babies is over 6.5 pounds?

(d) The weight of 20 newborn babies are recorded. What is the probability that at least 3 of them weight over 8 pounds?