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Unformatted text preview: will wait for more than 3 minutes. Find the value of z for the following: a. P(Z>z) = 0.0655 b. P(Z<z) = 0.8686 c. P(1.67<Z<z) = 0.6715 d. P(z<Z<0) = 0.3531 The lifetime of all Everglo bulbs follow a normal distribution with a mean of 400 hours and a standard deviation of 50 hours. After how many hours will 80% of the Everglo bulbs burn out? The yearly cost of dental claims for the employees of D.S. Inc. is normally distributed with a mean of $75 and a standard deviation of $30. At least what yearly cost would be expected for the top 40% of the employees? The examination committee of the American Society for Quality passes 20% of those that take the exam. If the scores follow a normal distribution with an average score of 75 and a standard deviation of 16, what is a minimum passing score?...
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 Spring '08
 Hossain
 Normal Distribution, Standard Deviation, Variance, Probability theory, American Society for Quality

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