Urinary angiotensinogen (AGT) level is one quantitative indicator of kidney function. The article "Urinary Angiotensinogen as a Potential Biomarker of Chronic Kidney Diseases" (J. of the Amer. Society of Hypertension, 2008: 349-354) describes a study in which urinary AGT level (mg) was determined for a sample of adults with chronic kidney disease. Here is representative data (consistent with summary quantities and descriptions in the cited article):

An appropriate probability plot supports the use of the lognormal distribution (see Section 4.5) as a reasonable model for urinary AGT level (this is what the investigators did).
a. Estimate the parameters of the distribution.
b. Use the estimates of part (a) to calculate an estimate of the expected value of AGT level.

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