Assume that the anxiety scores for college students approximate a normal distribution with a mean of 25 and a standard deviation of 7. Find the proportion of college students with anxiety scores within 10 points of the mean. Report the proportion to 4 decimal places.

My answer was .8444. It was incorrect

In my homework, I converted the z score to be: -1.42 and 1.42 because I looked at the two sides (scores within 10 points of the mean). I looked at the B column. The value for 1.42 was: .4222, so I added 1.42+ -1.42= .4222+ .4222= 8444

Can you tell what is the mistake in my analysis?