Mean, median and mode are measures to find the center value. Following are Number of kilometers for 1 week of my walking(Rounded to nearest integer). Day 1: 11 Day 2:0 Day 3:5 Day 4:5 Day 5:7 Day 6:8 Day 7:6 Mean: Sum = 42 Number of values(n) = 7 Mean = sum/n = (42/7) = 6 Median: Sorted values: [0,5,5,6,7,8,11] Median is at the position:(7+1)/2 = 4 4th value in the sorted values.(middle value) Median = 6 Mode: Mode = 5 (Most frequent number) What is the median if n is even? If n is even then median is the mean of values at the position(n/2 and (n/2) +1) Day 8:5 Then sorted values: [0,5,5,5,6,7,8,11] n/2 = 8/2 = 4 (n/2)+1 = 5 Then median is mean of 5 and 6 Median = 11/2 = 5.5