Mathematics, 22.04.2020 02:22 xarianna2007

The lognormal distribution has been reported to be a good way to describe the distribution of corrosion-related pit depth for steel pipes in soil. In particular, data suggests the lognormal distribution with and is suitable for pit depth (mm) of buried pipes. =0.353and =0.654

a. For this distribution, compute the mean and variance of pit depth.
b. Compute the probability the pit depth is between 1 and 2 mm.
c. Compute the value x such that only 1% of all specimens have a pit depth exceeding x.

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