Posted by Jennifer on Friday, December 9, 2011 at 8:30am.
Prob 0 defective = (.93)^20
prob 1 defective = C(20,1) (.93)^19 (.07)
prob 2 defective - C(20,2) (.93)^18 (.07)^2
prob (at most 2 defective) = 1 - (sum of the above 3 probs)
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