Z score problem: pyridoxine in multiple vitamin, in grams

The amount of pyridoxine (in grams) in a multiple vitamin is normally distributed with ? = 110 grams and ? = 25 grams. Approximately 83% of the vitamins will have at least how many grams of pyridoxine?

this is what I've been ablt to come up with
using z scores.

z=x-mew / sigma
z=0.83

so 0.83 = (x - 110)/25
(0.83*25) +110=x
the problem???? My answer doen't match the professor's

Re: Z score problem

Not quite. You need to look up the z-score that corresponds to .83.

That is about .955