I need help it’s for a exam so please

How many $20 bills do you need to have to make $280

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.