In Machine Learning there are often three values that interests us and that are: Mean, Median and Mode.
Example: We have registered the speed of 13 cars:
speed = [99,86,87,88,111,86,103,87,94,78,77,85,86]
Mean
The mean value is the average value.
To calculate the mean, find the sum of all values, and divide the sum by the number of values:
(99+86+87+88+111+86+103+87+94+78+77+85+86) / 13 = 89.77
Median
The median value is the value in the middle, after you have sorted all the values:
77, 78, 85, 86, 86, 86, 87, 88, 94, 99, 103, 111
If there are two numbers in the middle, divide the sum of those numbers by two.
77, 78, 85, 86, 86, 86, 87, 87, 94, 98, 99, 103
(86 + 87) / 2 =
86.5
Mode
The Mode value is the value that appears the most number of times:
99, 86, 87, 88, 111, 86, 103, 87, 94, 78, 77, 85, 86 = 86