Find 20 percent of $20 by multiplying 0.20 x20
You get $4. That’s what he saved.
Answer:
last payment is 45% and is $225
Step-by-step explanation:
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.
2/5*1/2=2/10
his neighbor will get 2/10quart or 0.2quarts of jelly