Tìm ma trận của các hệ véctơ sau trênP3(t) a)a= 2−t+t2+ 2t3,b= 2t+t2−t3,c= 1 + 2t−t2−t3,d= 1−t2+t3

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