# Data representation

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In a set of values, the range is the difference between the greatest and the smallest value. The mean is the sum of all the values divided by the amount of values in the set of data. The median is the middle value of the set when it has been organised from lowest to highest value (if the amount of values is even, the median is the mean of the two middle values).

The frequency refers to how many times the same value occurs in a set of data. Data can be displayed in a frequency table with two columns, one for the value (x) and one for its frequency (f). The most frequent value in a set of data is called the mode. A set of data can have more than one modes.

Variance is a measure of how spread out the values in a data set are. Standard deviation is the square root of the variance. A population is a full set of values, while a sample is a smaller set of values drawn from the population. The sample can help us understand the population.

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