Wetzel

Math 155

12.2 – Measures of Central Tendency

Mean –   “average”

            Steps:

                        1.)  Add together all of the data items.

                        2.)  Divide the sum by the number of data items.

Median –        “middle”

            Steps:

                        1.)  Rewrite the data set in increasing order.

                        2.)  Count the number of data items,

                            if odd, the median is the data item in the middle.

                            if even, the median is the average of the two data items in the middle

Mode –   the data item that repeats the most

            No Mode:

            Multiple Modes:

HW:    p.702  #1 – 7odd, 13-19odd, 25-31odd