Median and Mode Lesson

​11.2 Median and Mode Lesson

Measures of Center​

​Previously we learned how to calculate the MEAN. Today we are going to find two other measures of center.

Multiple Choice

Find the Mean

• 2

• 3

• 9

• 6

Multiple Choice

Find the mean

• 5

• 18

• 3

• 7

​Vocabulary

​Measure of Center

Median

Mode​

​Vocabulary

​Measure of Center (Measure of Central Tendency): 3 ways to describe the center of a data set.

​MeAn: The average of a data set. To calculate Add up all the numbers and Divide by how many numbers there are.

MOde: The number or numbers that occur most OFTEN. There can be more than one mode, if a number appears the same amount in the data set: 2222 and 3333. There can be NO mode if there is not a number that is repeated.​

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​Vocabulary, continued

​Median: The value appearing at the center of a sorted version of the list, or the MeAn of the two central values if the list contains an even number of values.

• Put the numbers in order from least to greatest.

• Check off the smallest then the largest.

• Keep moving to the middle of the data set.

• If it is an odd set of numbers circle the middle number.​ There will be the same amount of numbers on each side of the circled number.

• If it is an even set of numbers circle the two middle numbers and find the MeAn. (Add two numbers and Divide by 2)​

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​

Mode​

Put the Data set in order from least to greatest.​

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​Finding the Median and Mode

​

Multiple Choice

The list shows the number of stories in the 11 tallest buildings in Springfield. Find the median.

40,38,40,37,33,30,20,24,21,17,19

• 40 stories

• 30 stories

• 23 stories

Multiple Choice

The list shows the number of stories in the 11 tallest buildings in Springfield. Find the mode.

40,38,40,37,33,30,20,24,21,17,19

• 40 stories

• 30 stories

• 23 stories

​Finding the Median and Mode Given a Bar Graph

​

Multiple Choice

Find the Median.

• 70

• 67

• 55

• 65

• 48

Multiple Choice

Find the Mode.

• 70

• 67

• 55

• 65

• No Mode

Put the Data set in order from least to greatest.​

​

6, 8, 8, 10, 11, 12, 15

​

Median: 10 (Odd number: 3 on each side of the median)

Mode: 8​

​Comparing the Data set:

​The median is 2 more laps than the mode.

​Finding the Median and Mode Given a Line Graph

​

Multiple Choice

Find the Median from the line graph.

• No Mode

• 8

• 9

• 13

Multiple Choice

Find the mode from the line graph.

• 11

• 8

• 7

• No Mode