Right, so I've missed quite alot in school and now started revising earlier than I would've. It might not even fall under the 'Advanced' category, sorry if that's the case. Stats don't make sense to me at all so please help.

If the costs of completion of a building are normally distributed with a mean of $700,000 and a standard deviation of $150,000, what are the chances of making a profit if the promised return is $1,000,000 and how much has to be obtained in order to have a 90% chance of making a profit?

Cheers for any tips.