Question

the salaries of the employees at four companies are summarized below. answer the questions about them.
company a: the range of salaries is $47,000 and the mean salary is $21,000.
company b: the range of salaries is $54,000 and the mean salary is $14,000.
company c: the range of salaries is $53,000 and the mean salary is $21,000.
company d: the range of salaries is $51,000 and the mean salary is $12,000.
(a) based on the information above, which companys salaries have the least variability?
company a company b company c company d
(b) based on the information above, which company has the highest salaries on average?
company a company b company c company d

Explanation:

Step1: Understand variability

Variability can be measured by range. Smaller range means less variability.

Step2: Compare ranges

Company A range = $47000$, Company B range = $54000$, Company C range = $53000$, Company D range = $51000$. Company A has the smallest range.

Step3: Understand average

Average is measured by mean. Higher mean means higher average salary.

Step4: Compare means

Company A mean = $21000$, Company B mean = $14000$, Company C mean = $21000$, Company D mean = $12000$. Company A and Company C have the highest mean.

Answer:

(a) Company A
(b) Company A, Company C