Statistics....Post your doubts here!

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Guyz this is an individual thread for stats paper 6 .... post ur doubts here and post link if its in the past papers.
 
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well, it would be nice if anyone can share some good notes/websites/exercises for permutation and combination.
I sucks in this particular chapter ><
 
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i had some ambiguity in below quest:
1) P(Z>a)=0.8888 , a is negativ,
1-fi(-a)=o.8888
1-[1-fi(a) ]=o.8888
the other solution of quest i found:

2)p(z<t)=0.25, t is negativ
fi(-t)=0.25
1-fi(t)=0.25..
can anyone tell me this difference and concept how to solve such type of quest plzzz:(:(
 
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