Find the median, mean, and mode. b. Carl scored a 20 on his fifth exam

Carl had scores of 90, 95, 85, and 90 on his first four tests. a. Find
the median, mean, and mode.b. Carl scored a 20 on his fifth exam. Which
of the three averages would Carl want the instructor to use to compute
his grade? Why?c. Which measure is affected most by an extreme score?