Statistics Review

The median is the middle value in a data set when the numbers are arranged in ascending or descending order.

To calculate the mean, add all the numbers in the data set and then divide by the total number of values.

Standard deviation is a measure of the amount of variation or dispersion in a set of values.

For an even set, the median is the average of the two middle numbers after sorting the data.

Standard deviation = sqrt(Σ(xi - μ)² / N), where μ is the mean and N is the number of values.

A low standard deviation indicates that the values tend to be close to the mean, showing less variability.

The mean is the average of all values, while the median is the middle value when arranged in order.

The mode is the value that appears most frequently in a data set.

The range is the difference between the highest and lowest values in the data set.

Mean = (1 + 2 + 3 + 4 + 5) / 5 = 3.