Yusef adds all of the values in his data set and then divides by the number of values in the set.
what is yusef most likely finding?
a. the percent error
b. the median
c. the standard deviation
d. the mean

Yosef is finding D) the mean

D the mean

hope this helps

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero.