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Math 7 Directions:

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- Find your new seat using the seating chart found on the board.
- Clean out your binder:
- You may RECYCLE any materials from Module 1, 2, 3, and 4!
- All that should be left in your binder should be binder tabs for Module 5, 6, and 7.
- Stay organized!

Mean, Median, Mode and Range

We are learning to…analyze how adding another piece of data can affect the measures of center and spread.

Thursday, September 11, 2014

Key:

- Mean:
- A measure of center, also known as average.
- Mean is the sum of a set of data divided by the number of data items.

- Median:
- A measure of center, that tells the middle number in a set of data.
- If there is no single middle item, the number halfway between the two data items closest to the middle is the median.
- Basically…just find the mean of the two middle numbers.

- Mode:
- A measure of center for a set of data that tells the item(s) that appear most often in data set.
- There can be no mode.
- There can also be more than one mode

- Range:
- A measure of spread.
- The difference (subtraction) between the greatest data value and least value in a data set.

- Which MEASURE OF CENTER (mean, median, or mode) best represents our data? Explain your reasoning below in complete sentences.

- Predict: What if someone with a head circumference of 100 cm came into our class. How would this affect our data?
- How would this change the mean?
- How would this change the mode?
- How would this change the median?
- How would this change the range?

- Discussion Question:
- Which data measurement would be most affected by the addition of the outlier? WHY?

05 8 9

12 4 5 7 9

24 8 8 8

30 0 3

- The mode for the set of data is 30.
- The median for the set of data is 24.
- The mean for the set of data is 20.
- The range of the set of data is 3.

Key:

1 7 = 17

Mr. Cain has recorded the scores on his latest test in the stem and leaf plot below. He needs to report his test scores to Mrs. Green using a measure of center. Which of the following measurements should Mr. Cain use if he wants to report the highest measurement?

5

65 5 5 5

7 0 7

8 4 8

91 6

100 0 0

- Mean
- Median
- Mode
- They are all the same!

Key:

1 7 = 17