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Venn diagram and Probability

Hi I am quite bad at IB Maths Probablitiy, if you guys could help that would be much appreciated.

Attachment 26133

Events A and B are such that P(A) = 0.3, P(B) = 0.6 and P(A∪B) = 0.7

The values q, r, s and t represent probabilities.

(a) Write down the value of t.

(b) Show that r = 0.2.

(c) Write down the value of q and of s.

(d) Write down P(B').

(e) Find P(A|B')

Cheers!

Re: Venn diagram and Probability

Quote:

Originally Posted by

**tchoxobey** Hi I am quite bad at IB Maths Probablitiy, if you guys could help that would be much appreciated.

Events A and B are such that P(A) = 0.3, P(B) = 0.6 and P(A∪B) = 0.7

The values q, r, s and t represent probabilities.

(a) Write down the value of t.

(b) Show that r = 0.2.

(c) Write down the value of q and of s.

(d) Write down P(B').

(e) Find P(A|B')

**You need to understand that this is not a homework service.**

You are expected to show some efforts.

Hints: $\displaystyle q+r+x+t=1$

& $\displaystyle \mathcal{P}(A\cup B)=\mathcal{P}(A)+\mathcal{P}(B)-\mathcal{P}(A\cap B)~.$