a. If a normal distribution has μ = 30 and σ = 5, what is the 91st percentile of the distribution?
b. What is the 6th percentile of the distribution?
c. The width of a line etched on an integrated circuit chip is normally distributed with mean 3.000 μm and standard deviation .140. What width value separates the widest 10% of all such lines from the other 90%?
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