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Mean

The mean is a measurement of the average. To get it you add all the numbers up and divide by the amont of data you have e.g 

12+5+62+23+11+8+4+12/8

Median

The median is the middle number of a set of numbers e.g.

5, 8, 12, 18, 21, 35, 44, 52, 55 The median is 21.

If there are an even number of results, just add the two middle numbers together and divide by two.

Mode

The mode is the number which occurs the most in a set of data. e.g.

1, 1, 2, 2, 2, 6, 5, 5, 8,8, 9, 9, 9, 9, 10, 10, 11.  9 is the mode.

Range

The range is the difference between the highest and lowest number. e.g.

2, 5, 7, 8, 8, 13, 14, 17, 22.

22-2=20 the range is 20.

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