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S2 - markscheme error or just me?

ImageUploadedByStudent Room1465090152.009224.jpg

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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Original post by iMacJack
ImageUploadedByStudent Room1465090152.009224.jpg

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.

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

P(1≤X≤4)P(1\leq X\leq 4) = 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 :smile:

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