ENGR 371 Midterm: ENGR 371 Midterm 2008 Winter
Document Summary
A bin of 40 parts contains 5 that are defective. A sample of three is selected at random without replacement: what is the number of the elements of the sample space of this experiment, let"s consider an event such that all three selected parts are defective. Elements of this sample space have 3 parts. These parts can be defective d or not defective n . Elements are {ddd, ddn, dnd, ndd, nnd, the number of the elements of this sample space is ndn, dnn, nnn}. the number of possible ways that 3 parts can be selected at random without replacement are: (cid:6) (cid:4)(cid:4) (cid:5) This event includes all the elements which have all three parts defective and therefore we have only element in this event which is {ddd}. The number of possible ways that 3 defective parts can be selected at (cid:3) 3 random without replacement are: (cid:6) (cid:4)(cid:4) (cid:5)
