The systolic blood pressure of male adults is normally distributed with a mean of 127.7 and a standard deviation of 19.2.
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Specify an interval in which the blood pressures of approximately 68% of the adult male population fall.
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Specify an interval in which the blood pressures of approximately 95% of the adult male population fall.
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Specify an interval in which the blood pressures of approximately 99.7% of the adult male population fall.