March 31, 2020, 07:53:07 pm

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#### Bri MT

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##### Re: QCE Specialist Maths Questions Thread
« Reply #15 on: March 22, 2020, 10:02:54 am »
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Sorry, I have another question!
I'm not quite sure how to do conditional probability for exponential probability distributions and I'm stuck on part c) of attached question.
Hopefully, that's my last question for now.
Much appreciated!

Hey,

Recall that:
$p_{x|y} = \frac{p_{X,Y} (x,y)}{p_X (x)}$

Let's think about what this means. We know that something being greater than 5 AND greater than 10, really just means it's greater than 10. So this allows us to find $p_{X,Y} (x,y)$  (use your result from step a)

Let me know if you're still confused and I'm happy to step you through it but it would be great to see your working/thoughts