This dot plot is symmetric, and the data set has no extreme values.

What is the best measure of center for this dot plot?
A. The interquartile range (IQR)
B. Either the mean or the median
C. The smallest value
D. The mean absolute deviation (MAD)

An observer(o) spots a plane(p) taking off from a local airport and flying at a 29 degree angle horizontal to her line of sight and located directly above a tower(t). the observer also notices a bird circling directly above her. if the distance from the plane(p) to the tower(t) is 6,000ft., how far is the bird(b) from the plane(p).