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. Use the histogram to answer the question. The blood pressure readings were given to the nearest whole number.
-What common class width was used to construct the frequency distribution?

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. Use the histogram to answer the question. The blood pressure readings were given to the nearest whole number. 
-What common class width was used to construct the frequency distribution?

Quizplus · Accepted Answer

The common class width in a frequency distribution is the difference between the upper limit of one class and the upper limit of the previous class (or the lower limit of one class and the lower limit of the previous class). It is consistent across all classes in a well-constructed frequency distribution. The choice of 10 suggests a base-10 system, which is commonly used for ease of calculation and understanding.

A Nurse Measured the Blood Pressure of Each Person Who