2. definitions Data set: Data Value: Measure of Central Tendency: A group of related facts expressed as numbers. One of the entries of the data set. A single value that describes a data set.

3. Mean Mean = The mean of a data set is the sum S of the data values divided by the number of data values N. Mean =

4. Median The median is the middle value of an ordered set of data. For an even number of values, the median is the average of the two middle values.

5. Mode The mode of a data set is the data value that occurs most often. A data set may have one mode, no mode, or several modes.

6. Example: p. 73, #5 Noontime temperatures: 78, 86, 88, 93, 87, 84, 88, 88, 86, 85 Mean: Median: Mode: 863/10  86.3 78, 84, 85, 86, 86, 87, 88, 88, 88, 93 86.5 88

7. Example 2: p. 73, #6 Prices of athletic shoes sold at the Fast Foot Store during one day: $56.75, $63.89, $58.25, $75.59, $65.79, $63.98, $58.25 Mean: Median: Mode: 442.5/7 = $63.21 $56.75, $58.25, $58.25, $63.89, $63.98, $65.79, $75.59  $63.89 $58.25