Central Tendency
Finding the Mean:
1. Add all of the members of the set.
2. Divide by the number of members in the set.
Finding the Median:
1. Arrange the members of the set from least to greatest.
2. Divide the number of members by two and raise to the next highest number.
a. Example for odd number in the list - five in the list - 5/2 = 2 1/2 - raise to
the third number in the list.
b. Example for even number in the list - 6/2 = 3 - The median is between the
3rd and 4th members in the list.
Finding the Mode:
1. Look for the member in the set most frequently listed.
Finding the Domain:
1. Subtract the smallest member from the largest.
Example:
Original list - 2, 4, 3, 1, 5, 3 Rearranged list - 1, 2, 3, 3, 4, 5
Mean = (1 + 2 + 3 + 3 + 4 + 5)/6 = 18/6 = 3
Median = 1, 2, 3 }{3, 4, 5 - Going between the two "threes," the median = 3.
Mode = Number most frequently listed - 3.
Domain = 5 - 1 = 4.
