A particular fruit's weights are normally distributed, with a mean of 308 grams and a standard deviation of 31 grams.

Question

The heaviest 9% of fruits weigh more than how many grams?

Give your answer to the nearest gram.

Answer 1

so 91 percent weight X or below.

I get about 349 grams.

check it here.
http://davidmlane.com/hyperstat/z_table.html

Answer 2

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 = (score-mean)/SD

Insert values and solve for score.

Answer 3

How did you get 349?

I checked the Z table and still don't get how you end up with 349