b$.$ Construct a frequency table for delivery performance for last month.

c$.$ Construct a relative frequency table for delivery performance last month. $($Round your answers to $2$ decimal places.$)$ Speedy Swift is a package delivery service that serves the greater Atlanta, Georgia, metropolitan area. To maintain customer loyalty,

one of Speedy Swift's performance objectives is on$-$time delivery. To monitor its performance, each delivery is measured on the

following scale: early $($package delivered before the promised time$),$ on$-$time $($package delivered within $5$ minutes of the promised

time$),$ late $($package delivered more than $5$ minutes past the promised time$),$ lost $($package never delivered$).$ Speedy Swift's objective is

to deliver $99\%$ of all packages either early or on$-$time. Another objective is to never lose a package.

Speedy collected the following data for last month's performance:

Click here for the Excel Data File

a$.$ What scale is used to measure delivery performance? What kind of variable is delivery performance?