Inspected for defectives by an engineers


An incoming lot of silicon wafers is to be inspected for defectives by an engineers in a microchip manufacturing plant. In a tray containing 20 wafers, assume 5 are defectives. Four wafers are to be randomly selected for the inspection. Find the probability that -

(a) All four are nondefective.

(b) At least 1 is nondefective.

(c) Given that at least 1 is defective, what is the probability that all 4 are defective?

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Basic Statistics: Inspected for defectives by an engineers
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