Mean, Median, and Mode

Act One

Seven friends are collecting Elvis Presley trading cards. They have the following amounts: 9, 12, 13, 5, 9, 13, and 9.

1. If they were to stand in a line in order from the lowest number of cards to the highest, which amount of cards would be right in the middle?

2. What is the most common number of cards?

3. If the friends wanted to divide all their cards up so they all had the same amount, how many would they each have?

Go over homework. Then watch the following videos.

Stats Unit - mean, median, and mode - March 16.mp4

3M's - Mean, Median and Mode Rap _ Mister C (Song #7).mp4

1. Briefly discuss what the students learned from the videos.

Point out that if there are two numbers with the same frequency and they are the highest, both of these numbers are the mode. If each number appears only once, there is no mode.
Also point out that if the median is between two numbers and they can't figure out exactly what the median is, they average those two numbers.
- i.e. add those two numbers together and divide by 2. This is the median.

2. Use the make connections problem on pg.470 to further investigate the mean as a balance point.

Find the mean of the data set
Find the distance from the mean for 1) all values less than the mean. 2) all values greater than the mean
Total each set of distances. If the distances greater and the distances less have the same totals from the mean, it is a balance point.

3. Have students find the mean, median, and mode of their own data set.

4. Go Math

Pg 471 #3

Pg. 475 #1-3, 6

*Note: I like to play the mean, median, mode song all through class as the students work on this. That way, they never forget it.

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