If the number of values is even, the median is the average of the two middle numbers.
Example 1:
5, 6, 6, 7, 8, 9
Median = (6 + 7)/2 = 6.5
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Mean
The mean is the average of all values. You can calculate the mean by adding up all values and dividing the result by the number of values.
Grades from class 2R: 5, 6, 10, 8, 6, 7, 9, 5, 8, 7, 6.
QUESTION:
What is the mean in this case?
You may work it out on paper!
ANS
timer
1:30
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Mean
The mean is the average of all values. You can calculate the mean by adding up all values and dividing the result by the number of values.
Grades from class 2R: 5, 6, 10, 8, 6, 7, 9, 5, 8, 7, 6.
The mean is the grade (5 + 6 + .... + 6)/11 = 77/11 = 7.
Doing this simpler is shown in the next slide!
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Mean
If you have a frequency table, you can calculate the mean by first multiplying all values with their frequency, adding up the results and dividing that result by the total of the frequencies.