Gears produced by a grinding process are categorized either as conforming (suitable for their intended purpose), downgraded (unsuitable for the intended purposed but suitable for another purpose), or scrap (not usable). Suppose that 80% of the gears produced are conforming, 15% are downgraded, and 5% are scrap. Ten gears are selected at random
a - What is the probability that one or more is scrap?
b - What is the probability that more than two are either downgraded or scrap?
c - What is the probability that exactly nine are either conforming or downgraded?
d - What is the probability that exactly seven are conforming, two are downgraded and one is scrap?
e - What is the probability that exactly seven are conforming and the other three are downgraded?
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