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Statistics and Probability: Defective Nokia Cell Phone & Antennas; Assembly Times For Weston

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Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:

a. None of the antennas is defective.
b. Three or more of the antennas are defective.

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The accounting department at Weston Materials, Inc., a national manufacturer of unattached garages, reports that it takes two construction workers a mean of 32 hours and a standard deviation of 2 hours to erect the Red Barn model. Assume the assembly times follow the normal distribution.

a. Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
b. What percent of the garages take between 29 hours and 34 hours to erect?
c. What percent of the garages take 28.7 hours or less to erect?
d. Of the garages, 5 percent take how many hours or more to erect?

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Solution Summary

The solution provides step by step method for the calculation of probability. Formula for the calculation and interpretations of the results are also included.

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