R help - Nov 2008 - Estimating mean and standard deviation of lognormal distribution between two points

This is more of a statistical question.  Let's say I have two numbers.  One
is a lower bound and the other is a point estimate to the right of the lower
bound.  Now, let's say I want to be able to estimate the mean and standard
deviation of a lognormal distribution, where 95% of the density falls within
the range of the lower bound and the point estimate.  Concomitantly, can an
exponential distribution be described in the same fashion?

Any help would be greatly appreciated.

JB

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