 Quote by Ray Vickson
Yes, but I think you have already been given enough hints by others. Just look at the diagram, sit down, relax, and _think_. Don't try to write down the answer right away: approach it systematically, piece-by-piece, and don't worry if it takes longer than you think it should. After you see what is happening you can go back and clean it up.
RGV
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still on question 1) i dont understand why (45 - mu) / sigma is positive 0.67, could you explain please?
for c i done (1-0.6463)/3 as there is 3 parts, with the shaded region being the smallest, which gets me the correct value.
For D I've standardized it but i'm not sure what value i should put it against...