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Jim’s systolic blood pressure is a random variable with a mean of 145 mmHg and a standard deviation of 20 mmHg. For Jim’s age group, 140 is the cutoff for high blood pressure.

If Jim’s systolic blood pressure is taken at a randomly chosen moment, what is the probability that it will be, (a) 135 or less?
(b) 175 or more?
(c) between 125 and 165?

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