A normal distribution has mean value 100 and ? (standard deviation) 15, find the area in (a) (65
Let x have an exponential distribution with mean ?>0.
Give the pdf of x
If x and y are positive numbers, prove P(X>x+y)/(P(X>x)=P(X>y) (P is the integration of pdf)
Find E(x)
Let X have an exponential distribution with mean 20. Compute
P(10
P(x>40)/P(X>10)