1. We will review measures of central tendency.

2. Create a Scatterplot from the Data and Draw in a Line of Best Fitz
Create a Scatterplot from the Data and Draw in a Line of Best Fit

3. Vocabulary review
Range
Mean
Median
Mode
Outlier

4. Measures of central tendency are used to describe the middle of a data set.

5. Find the mean, median and the mode of the data set.
21, 21, 28, 29, 30, 28, 32
mean:
= 189
1897
= 27
median:
The median is 28.
mode:
21, 28
range:
32 – 21 = 11

6. A fast food restaurant collects the soft drink cans for recycling
A fast food restaurant collects the soft drink cans for recycling. The number of cans collected in two weeks are given below.
84, 97, 77, 31, 84, 63, 58, 72, 47, 84, 69, 94, 43, 68
Range:
Mean:
Median:
Mode:

7. Don’s music album had the following tracks: 15 rock, 8 classical, 12 hip hop, 10 pop, 15 lullabies, 13 vintage candy jingles and 17 rap.
Range:
Mean:
Median:
Mode:

8. Box and whisker plots
A quartile is a percentile measure that divides the total into 4 equal parts.

9. What is the median? What percentage of data is below the median?

10. z z
Stem and Leaf Plots
A Stem and Leaf Plot is a special table where each data value is split into a "stem" (the first digit or digits) and a "leaf" (usually the last digit).

11. Cups of coffee sold at a vending machine outlet in two weeks are as follows.
What is the average sales?
65 cups
How many days show sales less than 60 cups?
4 days
What is the maximum number of cups of coffee sold in a day?
78 cups