Kelly's Service Station does a large business in tune-ups. Demand ...

[rl]

Kelly's Service Station does a large business in tune-ups. Demand has been averaging 210 spark plugs per week. Holding costs are .01 per plug per week and reorder costs are estimated at 10 per order. Kelly does not want to be out of stock on more than 1 of his orders. There is a one-day delivery time. The standard deviation of demand is five plugs per day. Assume a normal distribution of demand during lead time and a 7-day work week.
 a. What inventory policy do you suggest for Kelly's station?
  b. What is the average amount of safety stock for the reorder point in (a)?
  c. What are the total variable weekly costs including safety stock costs?

Question 2

Which of the following properties of a binomial experiment is called the stationarity assumption?
 a. The experiment consists of n identical trials
  b. Two outcomes are possible on each trial
  c. The probability of success is the same for each trial
   d. The trials are independent

[itsakadoozi]

Answer to Question 1

a. Order 648 every 3.08 weeks when supply reaches 42
b. 12 spark plugs
c. 6.60

Answer to Question 2

c