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Probability in birth weight between babies

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Consider babies born in the "normal" range of 37 - 43 weeks gestational age. Extensive data supports the assumption that for such babies born in the United States, birth weight is normally distributed with mean = 3432 grams and standard deviation = 482 grams.

What is the probability that the birth weight of a randomly selected baby of this type:
a. is between 3000 and 4000 grams
b. exceeds 4000 grams
c. is either less than 200 grams or greater than 5000 grams
d. is no more than 3432 grams

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