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# Normal distribution question? URGENT!!

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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
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
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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