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8. Women have pulse rates that are normally distributed with a mean of 77.5 beats per minute and a standard deviation of 1 1.6 beats per minute. If one woman is picked at random, find the probability that: a) the woman's pulse rate is less than 70 beats per minute. b) the woman's pulse rate is greater than 73 beats per minute. c) the woman's pulse rate is between 60 and 68 beats per minute