Use the Data Given Below to Answer the Following Question(s)

Use the data given below to answer the following question(s) .
Following is an extract from the Employee Payroll Database of HFR Informatics Inc. $\begin{array}{|l|l|l|l|c|}\hline\text { Employee } & \text { Ethnic Group } & \text { Gender } & \begin{array}{c}\text { Rank / } \\\text { Grade }\end{array} & \begin{array}{c}\text { Pay } \\\text { Scale }\end{array} \\\hline \text { Maria } & \text { Asian American } & \text { Female } & 3 & \text { A } \\\hline \text { Peter } & \text { White American } & \text { Male } & 2 & \text { B } \\\hline \text { George } & \text { Hispanic } & \text { Male } & 1 & \text { C } \\&\text { American }\\\hline \text { Smith } & \text { Black American } & \text { Female } & 1 & \text { D } \\\hline \text { Johnson } & \text { Alaska Native } & \text { Male } & 2 & \text { E } \\\hline \text { Thompson } & \text { Asian American } & \text { Male } & 2 & \text { B } \\\hline \text { Martinez } & \text { Alaska Native } & \text { Male } & 3 & \text { A } \\\hline \text { Lewis } & \text { White American } & \text { Female } & 2 & \text { B } \\\hline \text { Lee } & \text { Black American } & \text { Male } & 2 & \text { A } \\\hline \text { Taylor } & \text { Asian American } & \text { Female } & 1 & \text { B } \\\hline \text { Carter } & \text { Asian American } & \text { Male } & 2 & \text { C } \\\hline \text { Edwards } & \text { Hispanic } & \text { Male } & 2 & \text { E } \\&\text { American }\\\hline \text { Bailey } & \text { White American } & \text { Male } & 2 & \text { B } \\\hline \text { Cooper } & \text { White American } & \text { Male } & 2 & \text { A } \\\hline \text { Bill } & \text { Alaska Native } & \text { Male } & 3 & \text { E } \\\hline \text { Cox } & \text { Asian American } & \text { Male } & 1 & \text { A } \\\hline \text { Perry } & \text { Hispanic } & \text { Female } & 2 & \text { C } \\&\text { American }\\\hline \text { Flores } & \text { Alaska Native } & \text { Female } & 2 & \text { B } \\\hline \text { Woods } & \text { White American } & \text { Male } & 3 & \text { E } \\\hline \text { Cole } & \text { Asian American } & \text { Female } & 1 & \text { A } \\\hline\end{array}$
-While constructing a histogram, how is group width calculated?

A) number of groups × (lower limit of the last group + upper limit of the first group)
B) (upper limit of the last group - lower limit of the first group) / number of groups
C) (upper limit of the first group + number of groups) × lower limit of the last group + number of groups)
D) (lower limit of the first group - number of groups) × upper limit of the last group