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# Working with quantitative data

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• 1. Working with Quantitative Data
Measures of Central Tendency
Mean, Median, Mode
• 2. Measures of Central Tendency
Mean, median and mode are called measures of central tendency
They provide a one number summary of set of numbers
Since they can only provide one number to represent the entire data set, they target the center, but in different ways
• 3. How do you calculate a mean?
The following are the ages (in years) of all eight employees of a small company:
53 32 61 27 39 44 49 57
Find the mean age of these employees.
• 4.
• 5.
• 6. How do you find a median?
The following data give the prices (in thousands of dollars) of seven houses selected from all houses sold last month in a city.
312 257 421 289 526 374 497
Find the median.
• 7.
• 8. How do you find a median?
The following table gives the 2008 profits (rounded to billions of dollars) of 12 companies selected from all over the world.
Find the median of these values.
• 9.
• 10. How do you identify the mode(s)
The following data give the speeds (in miles per hour) of eight cars that were stopped on I-95 for speeding violations.
77 82 74 81 79 84 74 78
Find the mode(s) of these values.
• 11.
• 12. How do you identify the mode(s)
For the table in Question 3 on the previous page, find the mode(s) of these values.
• 13.
• 14. Pocket Camcorders
• 15. Pocket Camcorders – Mean, Median, Mode
Complete the above table using your calculator
• 16. Buffalo Wings
• 17. Buffalo Wings – Mean, Median, Mode
Download the calculator on rtnj.blackboard.com and complete the following table for homework.