Using the assembly$-$line balancing procedure, you have just determined the actual number of

workstations that will be used on an assembly line to be $6.$ The cycle time of the assembly line is $5$

minutes and the sum of all tasks required on the line is $24$ minutes. Which of the following is the

correct value for the assembly line's efficiency?

a$.0\mathrm{.}21$

b$.$ Cannot be determined from the information above

c$.0\mathrm{.}56$

d$.0\mathrm{.}25$

e$.0\mathrm{.}80$