Assume that in earthquake-resistant design, the following relations take place:
Y=ce^(x), where Y is the ground motion istensity at the buiding site, X is the magnitude of an earthquike, aned the constiet
eis selased to the disunce between the site and cenner of the carthouke. Asprming that X is expeectianlly diatributed,
f_(s)(x)=\lambda e^(-lenda x)with
x>=0and
\lambda >2. (a) Derive the PDF and CDV of Y , including the bounds, and sketch them. (b) determine the median (i.e 50%- fractile ) and 90% - fractile ( value of Y othat has a pribability of not exceed if 90% of of ) Y (c) Determine the mean and variance of Y by using the PDF of Y derived under (a). (d) Detenmine the mean and variance of Y directly from the PDF of X .