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

Question

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

Quizplus · Accepted Answer

The class width can be determined by finding the difference between the lower limit of the first class and the lower limit of the second class. In this histogram, the lower limit of the first class is 100 and the lower limit of the second class is 110, so the class width is 10. Therefore, the answer is D.

A Nurse Measured the Blood Pressure of Each Person Who