Calculate mean, median, mode and range
key notes :
The range is the difference between the greatest number and the least number.
The mean is the average of the numbers. You find the mean by adding the numbers together and then dividing by the number of numbers in the group.
The mode is the number that appears most often.
Learn with an example
A botanical garden supplied seedlings to 6 schools for Earth Day. The schools requested:
6 seedlings 7 seedlings 7 seedlings 8 seedlings 7 seedlings 9 seedlings
What was the range of the numbers of seedlings requested?
______seedlings
First, find the greatest number. The greatest number is 9.
Next, find the least number. The least number is 6.
Subtract the least number from the greatest number:
9 − 6 = 3
The range of the numbers of seedlings requested was 3.
What is the mean?
-7 -7 -9 -8 -8 -9 -8 -8
First, count how many numbers are in the group.
There are 8 numbers.
Now add all the numbers together:
-7 + -7 + -9 + -8 + -8 + -9 + -8 + -8 = -64
Now divide the sum by the number of numbers:
-64 ÷ 8 = -8
The mean is -8 .
What is the mode?
-3 -5 -3 -3 -6 -5 -6 -3
mode=______
First, arrange the numbers from least to greatest. Remember that with negative numbers, larger numbers like –6 (if you ignore the minus sign) are less than smaller numbers.
-6 -6 -5 -5 -3 -3 -3 -3
Now count how many times each number appears.
-6 appears 2 times.
-5 appears 2 times.
-3 appears 4 times.
The number that appears most often is -3.
The mode is -3.
let’s practice!
