You have been hired to determine the probability that it will rain in the month of March in the
city of La-La-Land (see Table P3) are greater than 2 inches, for this the data of
precipitation in the month of March for the past 31 years.
If we assume that the rainfall accumulation is a random variable X and has a log-normal distribution.
Determine the following to establish your solution:
a) Average value, E[X]
b) Variance and standard deviation, V[x] and v(V[X]), respectively
c)Parameters u and o for the log-normal distribution using equations 3 and 4,
respectively
, either?
Solving algebraically from Eq. 1 & Eq. 2 it can be shown that:


d) P(X ≥ 2 in)
e) P(X ≥ 3 in)