On Wednesday each week boys focus on graphing. Last week boys looked at using scales in pictographs and how to read pie charts using percentages, fractions and whole numbers.
This week we are covering mean, median and mode. Boys watched this quick video at the start of the session which helped to explain each of the concepts further.
MEAN - Also known as the average
Using a set of data add all the numbers together and then divide by the amount of numbers in that set.
E.g.
2, 4, 2, 6
Add them all together 2 + 4 + 2 + 6 = 14
Divide by 4 = 12 r 2
MEDIAN - Also known as the middle number
Using a set of data order from smallest to largest. If you have an odd set of data the median is the middle number, if you have an even set of numbers you add the two middle numbers together and then divide by 2 (average of the two middle numbers).
E.g. for an odd set
2, 4, 2, 5, 7
Step 1 order smallest to largest - 2, 2, 4, 5, 7
Step 2 find the middle number = 4
E.g. for an even set
3, 6, 4, 5
Step 1 order smallest to largest - 3, 4, 5, 6
Step 2 find the two middle numbers = 4 and 5
Step 3 Find the average by adding them together and then dividing by two = 4.5
MODE - The number that occurs the most
E.g. 2, 5, 4, 6, 6, 4, 3, 6 = in this case 6 occurs the most
E.g. 2, 3, 2, 3, 4, 5, = in this case 2 and 3 occur the most
E.g. 1, 7, 4, 5, 9 = in this case no number occurs the most so there is no mode
https://www.youtube.com/watch?v=uydzT_WiRz4
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