To capture the actual Rent amount 95% of the time, predictions from the fitted equation should include a margin of error of about plus or minus ______ (round to the nearest ten dollars).
$114 (answer)
Here's a pic of the table. How did they get the answer? PictureTrail: Online Photo Sharing, Social Network, Image Hosting, Online Photo Albums

I know k2 = 95%. I thought it would be 2 * (standard error) but I don't see standard error on there.