mean: add all the numbers then divide by how many numbers in all
80+61+90= 231 ||| 231/3=77
median: the number in the middle ( don’t forget to put the numbers in order from lowest to highest)
61, 80, 90 80 is you median in this data set
mode: the number that appears the most in a data set(you won’t always have one)
you don’t have a mode for this one