Statistics

The mean, often called the average, is a measure of the center of a data set. It represents the value that all data points would equal if the total we

The median is the middle value of a data set when all values are arranged in order. It divides the data set in half, with an equal number of values on

The mode of a data set is the value that appears most frequently. It is used as a measure of center when identifying the most common value is more use

The interquartile range, or IQR, measures the spread of the middle 50 percent of a data set. It is calculated as the difference between the upper quar