Question: =+33. A printed circuit board (PCB) has 285 small holes, called joints, into which are inserted the thin leads or pins emanating from electronic components

=+33. A printed circuit board (PCB) has 285 small holes, called “joints,” into which are inserted the thin leads or “pins” emanating from electronic components soldered to the PCB (see Example 5.20).

Assuming that the quality of the solder joint at any pin is independent of the quality at any other pin, a binomial mass function can be used to describe x, the number of defective solder joints. Answer the following questions, given the probability that a given solder joint is defective is .01:

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