Respuesta :

first find average
(5+5+5+5+7+9)/6=6
now see how much they each are differnt
5 to 6 is 1
5 to 6 is 1
5 to 6 is 1
5 to 6 is 1
7 to 6 is 1
9 to 6 is 3

average those
(1+1+1+1+1+3)/6=8/6=4/3=1.333

answer is 1.33