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A nurse measured the blood pressure of each person who visited her clinic. Following is a relative-frequency histogram for the systolic blood pressure readings for those people aged between 25 and 40 years. The blood pressure readings were given to the nearest whole number. Approximately what percentage of the people aged 25-40 had a systolic blood pressure reading between 110 and 139 mm Hg inclusive?

A nurse measured the blood pressure of each person who visited her clinic Following is a relativefrequency histogram for the systolic blood pressure readings fo class=

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Explanation

For the blood pressure reading between 110 and 139 mm Hg inclusive

we will have

Thus, we will have (0.35 + 0.25 +0.15) x 100% = 75%

Thus, Approximately 75% of the people aged 25-40 had a systolic blood pressure reading between 110 and 139 mm Hg inclusive

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