Mean, median and Mode

The mean, median and mode are all measures of the average, or central tendency, of a set of data.The mean is the sum of all the values divided by the number of values. It uses every value but is affected by extreme values (outliers).The median is the middle value when the data are put in order. If there is an even number of values, it is the mean of the two middle values. It is less affected by outliers.The mode is the value that occurs most often. It is the only average that can be used for categoric data.Example: the number of leaves on seven seedlings was 4, 6, 6, 7, 8, 9 and 16.Mean = 56 ÷ 7 = 8. Median = 7 (the fourth value). Mode = 6.The range is the difference between the highest and lowest values (16 − 4 = 12). It gives a simple idea of spread but depends on only two values.