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. The blood pressure
Readings were given to the nearest whole number. What class width was used to construct the relative
Frequency distribution?
A) 11
B) 9
C) 100
D) 10

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. The blood pressure
Readings were given to the nearest whole number. What class width was used to construct the relative
Frequency distribution? 
A) 11 
B) 9 
C) 100 
D) 10

Quizplus · Accepted Answer

To find the class width, we need to divide the range of values (highest value - lowest value) by the number of classes. Since the histogram shows 10 classes with a range of 119-89=30, the class width is 30/10=3. Therefore, the answer is D) 10.

A Nurse Measured the Blood Pressure of Each Person Who