(Choose 1 answer)
(See picture)
A. 0.41
B. 0.61
C. None of the other choices is correct
D. 0.31
E. 0.51
A student doing a summer internship in a com-pany was asked to model the lifetime of cer-tain equipment that the company makes. After a series of tests, the student proposed that the lifetime of the equipment can be modeled by a random variable X that has the probability density function
0 20
f(x)=xe-x/10,x>0
100
What is the probability that the lifetime of the equipment exceeds 20?
Exit 2
