C ohm.lumenlearning.com/assess2/index.php?cid=57064&aid=4143804&r=61bOfdde88ad6#/skip/13 SCUTE. U/ 1UU 0/ 15 answered Question 13 Nancy is a waitress at Seventh Heaven Hamburgers. She wants to estimate the average amount each table leaves for a tip. A random sample of 5 groups was taken and the amount they left for a tip (in dollars) is listed below: $12.00 $8.00 $5.00 $4.00 $11.00 a.) Find a 90% confidence interval for the average amount left by all groups. (*round to the nearest cent*) $