A batch of parts contains 100 parts from a local supplier of tubingand 200 parts
ID: 2916159 • Letter: A
Question
A batch of parts contains 100 parts from a local supplier of tubingand 200 parts from a supplier
of tubing in the next state. (adapted from [Montgomery andRunger 1999])
a. If four parts are selected, at random and without replacement,what is the probability
they are all from the local supplier?
b. If six parts are selected, at random and without replacement,what is the probability
that at least three are from the local supplier?
c. If ten parts are selected, again randomly and withoutreplacement, what is the
probability that at least one is from the supplier in the nextstate?
Explanation / Answer
c.1-(100/300)(99/299)(98/298)(97/297)(96/296)(95/295)(94/294)(93/293)(92/292)(91/291)= 0.988
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