Answer:

85 + 82 + 90 + 81 + 92= 430 ÷ 5 = 86

Mean: 86

86-85=1 86-82=4 90-86=4 86-81=5 92-86=6

1+4+4+5+6=20÷5

MEAN DEVIATION=4

Step-by-step explanation:

Find the mean of all values

Find the distance of each value from that mean

Then find the mean of those distances