Use the Data Given Below to Answer the Following Questions)

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