I have 100 items of a product in stock. The probabilitymass function for the product’s demand D is P(D 90) P(D 100) P(D 110) 13. a Find the mass function, mean, and variance of thenumber of items sold.b Find the mass function, mean, and variance of theamount of demand that will be unfilled because of lackof stock.

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
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I have 100 items of a product in stock. The probability
mass function for the product’s demand D is P(D 90)
P(D 100) P(D 110) 1
3
.

a Find the mass function, mean, and variance of the
number of items sold.
b Find the mass function, mean, and variance of the
amount of demand that will be unfilled because of lack
of stock.

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