Seven-number summary

A seven-number summary is a way of summarising data using seven numbers. It tells you about the spread of the data so that you can quickly get an idea of what the data looks like. The seven numbers are the minimum, first quartile, median, third quartile, maximum, mean, and standard deviation. The minimum is the smallest value in the data. The first quartile is the value that is 25% of the way into the data. The median is the middle value of the data. The third quartile is the value that is 75% of the way into the data. The maximum is the biggest value in the data. The mean is the average of all the values. The standard deviation is the amount of spread in the data. So the seven-number summary gives you a quick way to summarise all the data and see the spread of the values at the same time.