Question 350161
20 * .97 = 19.4 the expected number of NON-defective mp3 players in the production run.
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Let x=.97 and y=.03
Expand (x+y)^20
x^20+20x^19y+190x^18y^2+1140x^17y^3=.9973 probability that at least 17 mp3 players are NON-defective
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Ed