Mean, Median, Mode, Range, Interquartile Range

The mean is the average of a set of numbers, calculated by adding all the numbers together and dividing by the total count of numbers.

To find the median, arrange the numbers in order from least to greatest and identify the middle number. If there is an even number of values, the median is the average of the two middle numbers.

The mode is the number that appears most frequently in a data set. A set may have one mode, more than one mode, or no mode at all.

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

The interquartile range is the difference between the first quartile (Q1) and the third quartile (Q3) in a data set, representing the middle 50% of the data.

Quartiles divide a data set into 4 equal parts, each representing 25% of the data.

The first step is to arrange the data set in ascending order.

The median is 8, as it is the middle number in the ordered list.

The mode is 5, as it appears most frequently.

The range is 30 - 10 = 20.