algebra
posted by paul .
the final exam in a course will count as 30% of the total. prior to the final exam, 245 points are possible. how many points will the final exam be worth?

0.3 * 245 = ?

I read that differently
"prior to the final exam, 245 points are possible" appears to imply that 245 points is 70% of the total
so total = 245/.7 = 350
so the final is worth 350245 or 105 points
(check: 105/350 = .3 = 30%) 
On a recent math exam, Alex received a score of 92%. His zscore is positive 2. If the mean for the exam is 84, what is the standard deviation?