Can you provide a little more information about your question? A value of -1.2 appears to be a z-score, so I am not completely clear on what you are asking. It may be that you are looking for the "tail area" that corresponds to a z-value of -1.2, or perhaps something different.

If you want to, you can upload an image of the table you have (because different textbooks use different tables) so that I can tell you how to find it out on your own.

Thank you

P.S. You can upload the table to www.mediafire.com then copy and paste the share link here