A doctor is using a growth chart for baby girls that indicates a 12-month-old baby girl has a mean weight of 21.1 pounds with a standard deviation of about 2.24 pounds. Assume that the weights are approximately normally distributed. a) What is the probability that a randomly chosen 12-month-old baby girl weighs less than 18.68 pounds?  b) What is the probability that a randomly chosen 12-month-old baby girl weighs more than 22.43 pounds?  c) What proportion of 12-month-old baby girls weigh between 19.6 and 22.87 pounds?

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