# Performance Measurement

## Examples

Find the mean, median and standard deviation of the following set of numbers:

1, 1, 2, 2, 2, 3, 3, 3, 3, 4, 5, 6, 6

### mean

Add up all the numbers and divide by the number of numbers

1 + 1 + 2 + 2 + 2 + 3 + 3 + 3 + 3 + 4 + 5 + 6 + 6 = 41

35/13 = 3.154

**the mean is 3.154**

### Median

The median is the middle value - half the scores are lower and half are
higher. In 13 numbers ordered in ascending order, the 7th number is the
median.

1, 1, 2, 2, 2, 3, **3**, 3, 3, 4, 5, 6, 6

**the median is 3 **

### mode

The mode is the most frequently occuring number. 3, occuring 4 times, occurs
most often in our set and so this is the mode.

**the mode is 3 **