a)
has CDF


where the last equality follows from independence of
. In terms of the distribution and density functions of
, this is

Then the density is obtained by differentiating with respect to
,

b)
can be computed in the same way; it has CDF


Differentiating gives the associated PDF,

Assuming
and
, we have


and


I wouldn't worry about evaluating this integral any further unless you know about the Bessel functions.
Tenth have to make answer longer for this app sorry
5003\4 as a mixed number=125 3\4
divide 4 by 5003 using long division
answer=125 3\4
Answer:
Kane
Step-by-step explanation: