Answer:
<h2><em><u>x</u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>36</u></em></h2>
Step-by-step explanation:





=> <em><u>x</u></em><em><u> </u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>36</u></em><em><u> </u></em><em><u>(</u></em><em><u>Ans</u></em><em><u>)</u></em>
You can find it by integrating twice:


Given that

, you have

and given

,

We will be using the fact that
, where
is the probability that the first bulb works and
is the probability that the second bulb works.
The probability that the first bulb works is
. However, when we take one out (given that the first bulb works) we now have 19 working bulbs and 4 bad ones. This means that the probability that the second bulb works is
.
Now, we can find our final probability:

The slope Lies on zero while vertical sits on 2