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SOB's systolic blood pressure is a random variable with a mean of 145 mmHG and a standard deviation of 20mmHG.

SOB's systolic blood pressure is a random variable with a mean of 145 mmHG and a standard deviation of 20mmHG. If the SOB's blood pressure is taken at a randomly chosen moment what is the probability it will be below 135? What is the probability it will be over 175?

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