Posted by **Angel** on Friday, March 2, 2012 at 9:17am.

Suppose that the birth weight of newborn babies in the U.S is normally distributed with a mean of 7 pounds and a standard deviation of 1.6 pounds. Let the random variable X be the birth weight of a randomly selected record of live birth.

a) What is the distribution of X?

b) What is the probability that a randomly selected record shows a birth weight less than 5 pounds?

c) What is the probability that a randomly selected record shows a birth weight greater than eleven pounds?

d) What is the probability that a randomly selected record shows a birth weight between 6 and 9 pounds

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