Statistics
posted by Sarah SHelp! .
A particular fruit's weights are normally distributed, with a mean of 308 grams and a standard deviation of 31 grams.
The heaviest 9% of fruits weigh more than how many grams?
Give your answer to the nearest gram.

so 91 percent weight X or below.
I get about 349 grams.
check it here.
http://davidmlane.com/hyperstat/z_table.html 
You can also find table in the back of your statistics text labeled something like "areas under normal distribution" to find that proportion related to a Z score.
Z = (scoremean)/SD
Insert values and solve for score.