A level maths stats help

Help! How did they work out that p(maths and English) =0.5 ??

(edited 1 year ago)

As the mark scheme says, using the addition law so
p(AuB) = p(A)+p(B)-p(AnB)

(edited 1 year ago)

OP

Original post by mqb2766

As the mark scheme says, using the addition law so
p(AuB) = p(A)+p(B)-p(AnB)

I don’t get how to work out what p(AnB)
I know it’s 0.5 coz of the markscheme but how do I work it out??

You know the other three terms in that equation, so simply rearrange and "solve" to get p(AnB)=0.5.
Why not try and write down clearly (probabilistic notation) what the question tells you, then sub into ... Or equivalently, as the ms says, draw the venn diagram.

(edited 1 year ago)

Original post by Alevelhelp.1

I don’t get how to work out what p(AnB)
I know it’s 0.5 coz of the markscheme but how do I work it out??

maybe try looking at the table? I wouldn’t have known either tbh but it looks like the table comes in handy

Original post by Alevelhelp.1

I don’t get how to work out what p(AnB)
I know it’s 0.5 coz of the markscheme but how do I work it out??

re-read the hint above. Do you know - or can you work out - what P(AuB) is from the table? This will come in handy!

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