(Choose 1 answer)
(See picture)
A. 3.5
B. None of the other choices is correct
C. 4
D. 2.5
Ε. 2.2
A test engineer discovered that the cumulative distribution function of the lifetime of an equipment in years is given by
F(x) = {1-e-2/5,x<0x ≥ 0
What is the expected lifetime of the equipment?
Π
