A CFO is looking at what percentage of a company's resources are spent on computing. He samples companies in the pharmaceutical industry and develops the following stem-and-leaf display (leaf unit = 0.1). What would be the first class interval for the frequency histogram?
A) 5.2

Question

A CFO is looking at what percentage of a company's resources are spent on computing. He samples companies in the pharmaceutical industry and develops the following stem-and-leaf display (leaf unit = 0.1).  What would be the first class interval for the frequency histogram?
A) 5.2 < 6.6 
B) 5.2 < 6.0 
C) 5.0 < 6.0 
D) 5.0 < 6.4 
E) 5.2 < 6.4

Quizplus · Accepted Answer

There are 50 data measurements. 2^k, where k = number of classes and 2^k is the closest value larger than 50. 2⁶ = 64, so 6 classes. Class length = (Max value − Min value)/6 = (13.5 − 5.2)/6. Length = 1.38, rounded to 1.4. The boundary for the first nonoverlapping interval is the smallest measurement and the sum of the first measurement and the length (5.2 + 1.38 = 6.58). So the first interval will contain the values 5.2 − 6.5.

A CFO Is Looking at What Percentage of a Company's