UnKoWn_AdventurE
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I got 0.7?
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mqb2766
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(Original post by UnKoWn_AdventurE)
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I got 0.7?
A) or b)?
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ghostwalker
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(Original post by UnKoWn_AdventurE)
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I got 0.7?
Part(b). I assumed "5 of which are known to be toffee" means there are 5 toffee and 15 fondants.

I got 0.816 (3 sig. fig.)

Post your working if you'd like someone to check it.
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UnKoWn_AdventurE
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(Original post by mqb2766)
A) or b)?
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Part a)
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ghostwalker
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(Original post by UnKoWn_AdventurE)
Part a)
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I struggle to make sense out of that. There are 20 chocolates, 5 are toffee, and 15 are fondants (we presume the latter to be the case).

Forget about Bayes' theorem for this part.

Consider this case:

There are 20 chocolates and 5 are toffee, and you pick one at random. What's the probability you pick a toffee?

Now suppose someone takes one away at random, so there are 19 left. You have no idea what it was. What's the probability now if you pick one, that it will be a toffee?
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