A study suggests that the birth weight of a full-term baby is distributed as a Normal random variable with mean 3,500 grams and standard deviation 600 grams. (a) What is the probability that the birth weight of a randomly se- lected full-term baby exceeds 4,000 gr.? (b) What is the probability that the birth weight of a randomly se- lected full-term baby is between 3,000 gr. and 4,000 gr.? (c) What is the probability that the birth weight of a randomly se- lected full-term baby is either less than 2,000 gr. or greater than 5,000 gr.?