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What are the Measures of Central Tendency?
Mode, Median, and Mean

What is the Mode of a data set?
 The value that occurs most often
 Not every data set has a mode.
 The Mode is not very stable, changing just one number in a data set can change the Mode dramatically.

What is the central value of an ordered distribution?
 The median
 To find it: Order the data
 For an odd number of data values in the distribution: Median + Middle data value
 For an even number of data values in the distribution: Sum of middle two values/2 = Median
 For an ordered data set of size n: Position of the middle value = n+1/2

What is the avearge that uses the exact value of each entry called?
 The Mean
 To compute the Mean: Mean = Sum of all entries/Number of entries

What is the notation used to indicate the sum of all data?
X

What is the symbol used to represent to sum all the entries in the distribution?
summation symbol

What is the Range?
The difference between the largest and smallest values of a data distribution.

