Question

The company Wings produces shafts by using 7075 aluminum. The company claims that 96% of the produced shafts have no defects (non-defective). We randomly select 250 shafts. What is the probability that the randomly selected L shafts are 97-99 % non-defective?

Answer #1

p = Probability that the produced shafts are non-defective = 0.96

Sample size of shafts = n = 250

To find the probability that the randomly selected L shafts are 97 - 99% non-defective we are going to use the Normal approximation of Binomial

97% of 250 = 242.5

99% of 250 = 247.5

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