Recommended first: Area of triangles and circles. You can still continue here.
Mean is what each would get if the total were shared equally. Median is the middle value when the list is sorted.
Work through it
Find the mean of 4, 8, 9.
Add.
Divide by 3, the number of values.
Find the median of 9, 2, 5, 7.
Sort.
Even count: average the middle two.
Watch out for this
Taking the middle without sorting.
The median only means something once the list is in order.
The short version
Mean: add them, divide by how many. Median: sort, take the middle. Range: biggest minus smallest.
Mean: add them, divide by how many. Median: sort, take the middle. Range: biggest minus smallest.
Your turn
Prefer paper? Print the Powers, geometry and data worksheet, with an answer key.
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