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ULTIMATE MATHS

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Example
Calculate the mean of the following number sequence:
1,3,7,8,8,9,12,17,21
To find the mean, we have to divide the sum of all numbers by the number of numbers.
1+3+7+8+8+9+12+17+21=86
86÷9=9.56 (3sf)
The mean value of any set of numbers can be found by using this method.

Example
Calculate the median of the following number sequence:
1,3,7,8,8,9,12,17,21
To find the median, we have to always cross out the two outer numbers until we get to the middle number.
1 , 3 , 7 , 8 , 8 , 9 , 12 , 17 , 21
We found out that 8 is the median. If there are two number in the middle, you have to find the number
between these two numbers (for example, if 8 and 10 are remaining, the median is 9).

Example
Calculate the mode of the following number sequence:
1,3,7,8,8,9,12,17,21
To find the mode we have to simplify find the most common number in the number sequence.
1,3,7,8,8,9,12,17,21
Since 8 appears twice it is the mode. Sometimes, there may not be a mode as no number appears more than once.

Organising Data
Next you should try working with stem & leaf plots. If you would rather select another topics, visit our library. Please share this page if you
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Presentation

Chapter 23.1: Learning Outcomes
Students will learn how to find the mean from a set of data!
Students will learn how to find the median from a set of data!
Students will learn how to find the mode from a set of data!

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