Hello,
Can anybody help me with this problem? (attached as pdf)
cheers
First part:
You will need the cumulative distribution function for time to failure:
$\displaystyle
P(t)=\int_0^t p(t) dt
$
where $\displaystyle p$ is the pdf of time to failure.
Then the probability that none have failed by $\displaystyle t_0$ is:
$\displaystyle
(1-P(t_0))^3
$
RonL