1. 1.6
Mean, Median, Mode

2. 1.6 – Mean, Median, Mode
To organize and summarize data we use Mean, Median, and Mode. These are called Measures of Central Tendencies. They measure where the “center” might be.

3. 1.6 – Mean, Median, Mode Mean (average) = sum of the data items
total number of items
Median – If you put the number in order, the median is the middle number. If there are an odd number of items, take the mean of the middle two numbers.
Mode – the number that appears the most times. You can have 0, 1, or more modes.

4. 1.6 – Mean, Median, Mode
Example – Find the mean, median and mode of the following.
14, 10, 2, 13, 16, 3, 12, 11
Mean =
Median =
Mode =

5. 1.6 – Mean, Median, Mode ALGEBRA REVIEW:
How would you solve the following?

6. 1.6 – Mean, Median, Mode
Example – Suppose your grades on three math tests were 82, 94, and 89. What grade do you need on your next test to have an average of 90?

7. 1.6 – Mean, Median, Mode
The range of a set of data is the difference between the greatest and least data values. The range gives a measure of spread or how far apart the data are.

8. 1.6 – Mean, Median, Mode Example – Finding the range
Find the range of the following:

9. 1.6 – Mean, Median, Mode
Stem and leaf plots – write the list of data shown
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