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An office supply company conducted a survey before marketing a new paper shredder designed for home use. In the survey, 80% of the people who
An office supply company conducted a survey before marketing a
new paper shredder designed for home use. In the survey, 80% of the people who
tried the shredder were satisfied with it. Because of this high satisfaction rate, the
company decided to market the new shredder. Assume that 80% of all people are
satisfied with this shredder. During a certain month, 100 customers bought this
shredder. Find the probability that of these 100 customers, the number who are
satisfied is
a) exactly 75,
b) 73 or fewer,
c) 74 to 85.
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