Question 927251: A stationery store has decided to accept a large shipment of ball-point pens if an inspection of 20 randomly selected pens yields no more than two defective pens. r is 2
Find the probability that this shipment is accepted if 5% of the total shipment is defective.
Find the probability that this shipment is not accepted of 15% of the total shipment is defective.
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! p(def) = .05, p(good) = .95 , n = 20
Accept if x ≤ 2
P(x ≤ 2) = binomcdf(20, .05, 2) = .9245 0r 92.45%
..........
p(def) = .15 , n = 20
reject if x > 2
P(x > 2) = 1 - P(x ≤ 2) = 1 - binomcdf(20, .15, 2) = 1 - .4049 = .5951 0r 59.51%
......
Using a TI calculator 0r similarly a Casio fx-115 ES plus
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