The frequency histogram for the heights (in cm) of the 25 students in a business statistics class is given below. 
What is the best measure of variability?
Definitions:
Net Requirements
The total quantity needed of a particular item, considering current inventory levels and future orders but excluding any on-hand inventory.
Gross Requirements
represent the total amount of materials or products required to meet production demands, before accounting for any existing inventory.
Product A
A placeholder name for a specific product, typically used in examples or theoretical discussions.
MRP II System
Manufacturing Resource Planning, an integrated method for effective planning of all resources of a manufacturing company.
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