A manager intends to order a new machine and must now decide on the number of spare parts to order along with the machine. The parts cost $400 each and have no salvage value. The manager has compiled a frequency distribution for the probable usage of spare parts, as shown. For what range of shortage costs would stocking one spare part constitute an optimal decision?
No. of
Spares Frequency
0 .08
1 .30
2 .24
3 .20
4 .18