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?
Systolic Blood Pressure for People Aged 25 - 40 Years 
A) 75%
B) 89%
C) 59%
D) 39%
Correct Answer:
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