The Frequency Distribution of the Number of Years of Service

Essay

The frequency distribution of the number of years of service for 100 employees is shown below. $$\begin{array} { | c | c | } \hline \text { Years } & \text { Frequency } \\\hline 0 \text { up to } 5 & 12 \\\hline 5 \text { up to } 10 & 16 \\\hline 10 \text { up to } 15 & 42 \\\hline 15 u p \text { to } 20 & 20 \\\hline 20 \text { up to } 25 & 10 \\\hline \text { Total } & 100 \\\hline\end{array}$$ a. Estimate the proportion of employees who have fewer than 10 years of service.
b. Estimate the proportion of employees who have more than 20 years of service.
c. Estimate the proportion of employees who have between 10 and 20 years of service.