For the data set 16, 17, 18, 19, 30, the mean is 20. What is the mean absolute deviation?
A. The mean absolute deviation is 16.
B. The mean absolute deviation is 4.
C. The mean absolute deviation is 20.
O
D. The mean absoluta deviation is 5.
O

$12. that is my answer.

step-by-step explanation:

explanation:

previous steps have made pa≅ pb ≅ st ≅ su. setting the compass width to ab allows you to make tu the same length. then δstu ≅ δpab by the sss congruence postulate, and ∠p ≅ ∠s by the reason cpctc.