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Normal distribution question? URGENT!!

1. X-N (45, SIGMA)
P(W<54)=0.75
SO 54-45/SIGMA = 0.67
I don't understand where the 0.67 has come from, it's not in any of the tables what happened to the 0.75, why is it 0.67
This came up in a paper before but I didn't understand it :'(
This question was from June 2007 Edexcel S1 Q2e
Please help me someone, my exam is tomorrow!
Thanks
2. BUMP
3. Sorry for the bumping but this is really urgent
4. (Original post by Cinnamon_Twist)
X-N (45, SIGMA)
P(W<54)=0.75
SO 54-45/SIGMA = 0.67
I don't understand where the 0.67 has come from, it's not in any of the tables what happened to the 0.75, why is it 0.67
This came up in a paper before but I didn't understand it :'(
This question was from June 2007 Edexcel S1 Q2e
Please help me someone, my exam is tomorrow!
Thanks
just so I can find it easily

5. I think you may be over-complicating things. Doesn't the question just ask you to find ? You've done most of the work already!
6. (Original post by Implication)

Thank you so so so so much! +rep

(Original post by olipal)
I think you may be over-complicating things. Doesn't the question just ask you to find ? You've done most of the work already!
yeah, I think I just panicked because the exam is tomorrow- thanks for the reassurance!
+rep
7. umm.. >>>http://www.examsolutions.co.uk/a-lev...d-solution.php <<< check it! =) hope it would help.
8. (Original post by olipal)
I think you may be over-complicating things. Doesn't the question just ask you to find ? You've done most of the work already!
Maths, Palmer Maths

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