A Nurse Measured the Blood Pressure of Each Person Who

Multiple Choice

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 (in mm Hg) were given to the
Nearest whole number. What class width was used to construct the relative frequency
Distribution? Systolic Blood Pressure for People Aged 25 - 40 Years

A) 11 years
B) 9 years
C) 10 years
D) 100 years