1. Do now 2
1. 4( ) + 5
2. (4  2)  2

2. Brain Pop

3. Objective:
You will learn to find the mean, median, and mode to describe a set of data.

4. Measures of Central Tendencies
Mean
Median
Mode

5. Mean = Average
8, 10, 6, 9, 8, 7

6. Hint: median of a highway is in the middle.
Median: is the middle number when the data is arranged in numerical order.
Hint: median of a highway is in the middle.
11, 9, 6, 14, 5, 5, 13
20, 30, 40, 10, 20, 90, 70, 80

7. Mode: is the number(s) or item(s) that appear most often.
17, 31, 29, 42, 17, 36, 24
50, 45, 45, 52, 49, 56, 56
65, 56, 57, 75, 76, 66, 64

8. Do Now Make a frequency table of the following data: Price($) Tally
Prices of ski boots
Price($)
Tally
Frequency
40-59
60-79
80-99
How many boots are less than $100
What is the scale?
What is the interval?

9. Check for Understanding
Whateverville's Temperatures One Week
Sunday 50°
Monday 65°
Tuesday 90°
Wednesday 106°
Thursday 10°
Friday 50°
Saturday 0°
Find the mean, median, and mode for the data.

10. Check for Understanding
1. Which do you think is the most important of today’s terms: mean, median, mode? Why?

11. Real World Application
Name the correct measure of central tendency for each situation…
1. We want to find the average age of 6th graders on our team.
2. The most popular school lunch.
3. Without calculating, would the mean, median, or mode be most affected by eliminating 1,000 from the list below? Which would be least affected? Explain.
50, , 60, 75, 1,000, 90, 100

12. Let's review
In your groups, create a data set of 10 numbers with a median of 8 and a mode of 10.
Please do this on a piece of loose-leaf to be handed in at the end of class.
(Possible answer: 1, 2, 3, 6, 7, 9, 10, 10, 10, 11)

13. Independent Preactice
Page 72 numbers dd

14. Be ready for a quiz tomorrow
Homework
Page 72 - numbers even
Page 72 - numbers 1-15 all
Be ready for a quiz tomorrow
(on lessons1-4)