Suppose that X has a lognormal distribution and that the mean and variance of X are 50

Question:

Suppose that X has a lognormal and that the mean and variance of X are 50 and 4000, respectively. Determine the following:
(a) The parameters and of the lognormal The probability that X is less than 150
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...