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Table 2 Mean, median and mode of haemoglobin measurements from 48 intensive care patients listed in Table 1

From: Statistics review 1: Presenting and summarising data

Measure

Calculation

Mean

The mean is the sum of the observations divided by the number of observations, in this case

Median

There are 48 observations in this dataset and so the median is the average of the 24th and 25th (i.e. the average of 9.7 and 9.9 = 9.8 g/dl)

Mode

Several values appear twice in this dataset, 9.9 appears three times and 9.4 appears four times. No value appears more than four times and so the mode is 9.4 g/dl