Description: Sal thinks through the effects of modifying a value in a data set. What will happen to the mean and median? Let's think about what happens to the median and mean of a set of numbers when I change one of the numbers. A group of four friends likes to bowl together, and each friend keeps track of his all-time highest score in a single game. Adam then bowls a great game and has a new high score of 290.*Teacher Advisor is 100% free.