Mean, Median, Mode, and Range

Mean

Mean: Average

1) First, order the numbers from least to greatest.

2) Next, add the numbers in the data set.

3) Then, divide the sum by the number of numbers in the set.

5, 7, 3, 5, 5

1) 3, 5, 5, 5, 7

2) 3 + 5 + 5 + 5 + 7 = 25

3) 25 / 5 = 5

Mean = 5

MedianMedian: Middle number when

numbers are ordered from least to greatest.

1) First, put numbers in order from least to greatest.

2) Then, cross out the end numbers until you get to the middle.

3) If there are two middle numbers, add them and divide by 2 to find the average.

5, 7, 3, 5, 5

1) 3, 5, 5, 5, 7

2) 3, 5, 5, 5, 7

3) 3, 5, 5, 5, 7

Median = 5

Mode

Mode : Number that appears the MOST.

1) First, put the numbers in order from least to greatest.

2) Then, find the number that appears the most often.

5, 7, 3, 5, 5

1) 3, 5, 5, 5, 7

2) 5 appears three times

Mode = 5

Range

Range: Difference between the biggest and smallest number.

*Subtract smallest from the biggest number in a data set.

1) First, put the numbers in order from least to greatest.

2) Then, take the biggest number and minus the smallest number.

5, 7, 3, 5, 5

1) 3, 5, 5, 5, 7

2) 7 – 3 = 4

Range = 4