I accidentally placed this question under the other statistics section. Sorry if it confused anyone. Here we go again...

I have a test tomorrow and I'm working on a practice problem right now that I can't see to understand. Please help!

The amount of Jen's monthly phone bill is normally distributed with a mean of $76 and a standard deviation of $12. Find the first quartile,

I understand that the mean goes in the middle of the bell curve, and the SD is the intervals between the other numbers on the curve. But how do I get that

?

If it helps, the answer is $67.96.