CS 131 PROGRAMMING ASSIGNMENT 5    

    Problem 22, p. 123. Calculate the delivery charges for 5 packages, 
    outputting the delivery charge for each. Print the average charge 
    per package at the end. SUBMIT THIS BEFORE STARTING THE * PART.

  * Select a reasonable range for package weight and incorporate error 
    checking into your program. At the end, print the average weight and
    delivery charge for the valid inputs and the number of invalid inputs.