Chapter 9, Problem 45AP

(a)

Summary Introduction

Interpretation:The mean flow time, average tardiness and number of tardy jobs are to be determined for the given data (problem 7).

Concept Introduction:

The following formula will be used −

  $\text{Tardiness = Flow time – Due date}$

  $\text{Mean flow time=}\frac{{\displaystyle \sum _{\text{i=1}}^{\text{n}}\text{Job completion time}}}{\text{Total number of jobs}}$

  $\text{Average tardiness = }\frac{\text{Total tardiness}}{\text{Number of jobs}}$

(b)

Summary Introduction

Interpretation:The mean flow time, average tardiness and number of tardy jobs are to be determined for the given data (problem 8).

Concept Introduction:

The following formula will be used −

  $\text{Tardiness = Flow time – Due date}$

  $\text{Mean flow time=}\frac{{\displaystyle \sum _{\text{i=1}}^{\text{n}}\text{Job completion time}}}{\text{Total number of jobs}}$

  $\text{Average tardiness = }\frac{\text{Total tardiness}}{\text{Number of jobs}}$

(c)

Summary Introduction

Interpretation: The mean flow time, average tardiness and number of tardy jobs are to be determined for the given data

Concept Introduction:

The following formula will be used −

  $\text{Tardiness = Flow time – Due date}$

  $\text{Mean flow time=}\frac{{\displaystyle \sum _{\text{i=1}}^{\text{n}}\text{Job completion time}}}{\text{Total number of jobs}}$

  $\text{Average tardiness = }\frac{\text{Total tardiness}}{\text{Number of jobs}}$