Worst exam I have ever taken. Really hoping I scraped an A, and I agree about timings, had no time to check and just ended up rushing!
Few questions about where I lost marks, if anyone would be kind enough to answer them  :
3d) - Venn diagram: I drew this out the right way two times. Guess what? I rubbed them both out. Not just faintly either, proper hard like an idiot. Just hoping on them having powerful scanners or something
5e) - F(y) probability distribution: I drew out the table right, but I think I wrote 0.4 instead of 0.2 for the 5 value. How many marks would I lose for this?
6c) - Last normal distribution question - I did what a few people were saying before: I wrote:
P(X<210)-P(X<200) = 0.98
P(z<5/sigma)-P(z<-5/sigma)=0.98
then I converted 0.98 into its z value, so:
5/sigma - -5/sigma = 2.06
5/sigma + 5/sigma = 2.06
5+5=2.06sigma=10
so sigma = 10/2.06=4.85 something.
I still can't see where I went wrong with this one, and how many marks would i get for it?
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