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Depths of pits on a corroded steel surface are normally distributed with mean 818 μm and...

Depths of pits on a corroded steel surface are normally distributed with mean 818 μm and standard deviation 29 μm.

A)   Find the 10th percentile of pit depths.

B)   A certain pit is 780 μm deep. What percentile is it on? (Round up the final answer to the nearest whole number.)

C)   What proportion of pits have depths between 800 and 830 μm?

Math   Statistics-And-Probability   
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