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# S2 - markscheme error or just me?

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1. Taken from January 2009 S2 exam

Okay - part C, surely it should be p(x<=4)-p(x<=1)??

Or am I going mental? Thanks!

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2. Upload the question as well
3. (Original post by iMacJack)

Taken from January 2009 S2 exam

Okay - part C, surely it should be p(x<=4)-p(x<=1)??

Or am I going mental? Thanks!

Posted from TSR Mobile
The latter.

= probability X is one of {1,2,3,4}, whereas you've clearly excluded the case for P(X=1)
4. (Original post by ghostwalker)
The latter.

= probability X is one of {1,2,3,4}, whereas you've clearly excluded the case for P(X=1)
Yep!! My bad, it was late! Thank you

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