Jun

1

probability - An injection molder produces golf tees that are 15.0% nonconforming?

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golf tees
K K asked:


An injection molder produces golf tees that are 15.0% nonconforming. Using the normal distribution as an approximation to the binomial, find the probability that, in a random sample of 300 golf tees, 34 or less are nonconforming

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    No Responses to “probability - An injection molder produces golf tees that are 15.0% nonconforming?”

    1. O'Neil on June 5th, 2010 8:12 am

      In the normal approximation to the binomial,

      mean = 300*0.15 = 45

      Standard deviation = sqrt(300*0.15*0.85) = 6.18

      z value = (34 - 45)/6.18 = -1.78

      Probability from z tables = 96.25 %