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Remember the sled dogs from the Median Concept? Well, let's look at the speeds once again.

Alaskan sled dogs travel varying speeds during the Iditarod. These strong, wonderful animals can travel at an average speed of anywhere from 5 to 15 miles per hours.

Here are some speeds from the last Iditarod.

10 mph

12 mph

8 mph

15 mph

9 mph

8 mph

7 mph

12 mph

Which speed is the mode of this data set?

This Concept is about figuring out the mode of a data set. You will be able to answer this question by the end of the Concept.

Guidance

Previously we worked on finding the mean and the median, now we can find the mode of a set of data too.

The mode is the value that occurs the most times in a set of data.

Mode sounds like most and that can be an easy way to remember it.

Let’s look at how to find the mode.

The chart below depicts the daily temperature in San Diego for the first seven days in August. Determine the mode for this set of data.

Date: Temperature:
Sunday 8/1 88^\circ F
Monday 8/2 83^\circ F
Tuesday 8/3 87^\circ F
Wednesday 8/4 89^\circ F
Thursday 8/5 82^\circ F
Friday 8/6 79^\circ F
Saturday 8/7 87^\circ F

To find the mode, look for the number that occurs most often. In this case, 87 is the mode because it appears twice in the set of data.

The mode is 87^\circ F .

Now we can find the mode of a set of test scores.

Katie’s first four test scores are 75%, 81%, 80%, and 84%. Determine the mode of Katie’s test scores.

In this case, there is not one number that occurs more than another. Therefore, there is no mode.

Mode = none

Here is another situation where the mode is a useful tool in analyzing data.

Miguel measured the height of eight students in his class in inches. Determine the mode of his classmate’s heights.

51 \quad 45 \quad 47 \quad 51 \quad 50 \quad 56 \quad 52 \quad 50

In this case, there are two data values that appear most often, 51 and 50.

The modes of Miguel’s data are 51 and 50.

Name the mode of each data set.

Example A

2, 3, 3, 5, 6, 7, 8, 9, 3

Solution: 3

Example B

12, 15, 67, 45, 44, 88, 90

Solution: No Mode

Example C

13, 13, 45, 45, 67, 89, 13, 67, 67, 67, 13

Solution: 67

Here is the original problem once again.

Alaskan sled dogs travel varying speeds during the Iditarod. These strong, wonderful animals can travel at an average speed of anywhere from 5 to 15 miles per hours.

Here are some speeds from the last Iditarod.

10 mph

12 mph

8 mph

15 mph

9 mph

8 mph

7 mph

12 mph

Which speed is the mode of this data set?

There are two speeds that occurred the most in this data set.

The first one is 8 mph - a rather slow speed.

The second one is 12 mph - a rather fast speed.

Vocabulary

Data
pieces of numerical information collected in a set.
Mean
the average value of a set of data.
Median
the middle value or score of set of data.
Mode
the value that appears the most in a set of data.

Guided Practice

Here is one for you to try on your own.

Name the mode in this data set.

2, 4, 5, 6, 2, 3, 4, 2, 2, 2, 7, 8, 9

Answer

Remember, when looking for the mode, we are looking for the value that occurs the most times.

The mode of this set of values is 2.

Video Review

This is a Khan Academy video on mean, median and mode.

Practice

Directions: Identify the mode for the following sets of data.

1. 2, 3, 3, 3, 2, 2, 2, 5, 6, 7, 7, 7, 7

2. 4, 5, 6, 6, 6, 7, 3, 2, 6, 5, 5

3. 23, 22, 22, 24, 25, 25, 25, 21, 20, 22, 27

4. 123, 120, 121, 120, 121, 125, 121, 121

5. 678, 600, 655, 655, 600, 678, 600, 600

6. 4, 5, 4, 5, 3, 3, 4, 4, 4, 4, 6

7. 6, 7, 8, 3, 2, 4, 4, 7, 7, 7

8. 11, 10, 9, 13, 14, 16, 11, 10, 11

9. 21, 23, 25, 22, 22, 27, 21, 22, 21, 21

10. 27, 29, 29, 32, 30, 32, 31, 33, 33, 33, 33

11. 34, 35, 34, 37, 38, 39, 39, 34, 34

12. 43, 44, 43, 46, 39, 50, 43, 43, 51, 51

13. 122, 100, 134, 156, 144, 110, 110

14. 224, 222, 220, 222, 224, 224, 221, 222, 223, 225

15. 540, 542, 544, 550, 548, 547, 547, 550, 550, 548

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