13.1 Central Tendencies Objective: Students will be able to identify the mean, median, and mode given a data set. They will also be able to identify what.

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Presentation transcript:

13.1 Central Tendencies Objective: Students will be able to identify the mean, median, and mode given a data set. They will also be able to identify what happens to each when one additional piece of data is added.

Notes Measure of Central Tendency: describe the center of data. Mean: average add all #’s # of items BEST: NO OUTLIERS 3, 5, 2, 5, 2, 3, 1

Median Notes Median: middle number. Must be least to greatest. If two numbers, add and divide by 2 BEST: NO OUTLIERS; NO BIG GAPS IN MIDDLE OF NUMBERS 3, 8, 2, 3, 8, 3, 10 11, 21, 43, 1, 5, 9

Mode Notes Mode: most occurring numbers. BEST: MANY REPEATED NUMBERS If numbers are up the same amount of times, there is NO MODE. 3, 4, 5, 3, 5, 6, 8, 3, 8

Range Formula: high # - low # 1, 23, 43, 32, 5, 39, 29 9, 32, 3, 39, 22, 38, 39 34, 38, 3, 4, 99, 23, 34

Find Mean 4, 5, 9, 3, 4, 8, 10, 3 10, 11, 4, 30, 45

Find Median 1, 5, 6, 8, 10, 7, 8, 9 5, 8, 9, 1, 2, 5, 7

Find Mode 12, 11, 10, 9, 8, 11, 15 1, 1, 8, 9, 8, 12, 5, 6, 7

Wrap Up Questions/Comments Hw: worksheet/test