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Mean Median Mode Range
Mean - The mean is defined as the sum of all values divided by the number of values. Also known as Average
Median - The median is the middle value in a list when values are sorted.
Mode - The mode is the number which appears most frequently.
Range - The range is the difference between the highest and lowest values.
Find The Mean
Find the mean
To find the mean, first add all the numbers together:
There are five numbers in the list so we divide by five:
The mean of the set is 3
Find the Median
Find the median of the dataset
Right now the numbers are out of order, so it is difficult to tell which number will be in the middle of the list. So first put the numbers in order:
We can see that 5 is in the middle of the list. There are two numbers less than 5, and two numbers greater than 5.
The median of this set is 5
Find the Mode
Find the mode of the dataset
Right now the numbers are out of order, so it is difficult to tell which number appears most often. So first put the numbers in order:
The number that appears most often is 4, so 4 is the mode of the set
Find the Range
Find the range of the data set
Right now the numbers are out of order, so it is difficult to tell which number is the largest or the smallest. So first put the numbers in order:
Now it is easier to see that the smallest number in the list is 1 and the largest number is 20
To find the range, subtract 1 from 20:
The range of the set is 19