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Median and Range
Quick Review
What are two examples of
measures of central tendency?
There are 11 grade 7 students in Ms. P's math class.
To find the median mark on the last math test, she listed their marks from greatest to least:
95,92,87,85,80,78,76,73,70,66,54
What is the median mark? (Middle number)
A new student enters Ms. P's class. She writes the test and receives a mark of 72.
To find the new median, the teacher includes her mark in the ordered list:
95,92,87,85,80,78,76,73,72,70,66,54
What is the new median?
(Note: When there are 2 middle numbers, the mean of the 2 will be the median.)
How would you find the median for a set of
numbers that are not in order?
Find the median for the following:
- 9, 6, 8
- 70, 89, 54, 47, 99
- 88, 42, 88, 70, 54, 63, 44, 88
When data is arranged in order, we can easily find the range.
95,92,87,85,80,78,76,73,72,70,66,54
The range of a data set tells how spread out the data is. It is the difference between the greatest and least numbers.
95-54 = 41
The range of marks is 41
Find the range for the following:
a) 2, 6, 10
b) 20, 50, 48, 98
c) 40, 30, 20, 100, 80, 10
Write 5 numbers, so that:
a) The mode is 10. The mean and median are equal.
b) The mode is 10. The mean is less than the median.
HW TIME
HANDOUT
QUESTIONS 1-6