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March 31, 2020, 07:53:07 pm

Author Topic: QCE Specialist Maths Questions Thread  (Read 948 times)

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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! ;D
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! :D

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 :)