January 26, 2016 Measures of Center (Central Tendencies)

Measures of Center: Numbers which are commonly used to represent sets of numbers. (A type of average)

Do you remember what the 3 measures of center are?

Hint:

They each begin with the letter "M".

Example: 1, 1, 2, 2, 3, 3, 3 Mode: ____1, 1, 1, 2, 2, 2, 3, 3, 3 Mode: ____1, 2, 3, 1, 2, 3, 1, 2 Mode: ____

Vocabulary:Range: Useful statistic to describe the spread of a set

of data.

Range = difference of maximum & minimum(largest #) (Smallest #)

Range = max - min

Find the range:1) 17, 29, 33, 34, 38, 40

2) 26, 37, 40, 33, 35, 38 What is the range?25

Mr. Booker has twelve students in his math class. Their current percentages are listed below.

80, 98, 74, 65, 80, 80, 100, 94, 96, 71, 98, 84

mean: ______ median: ______ mode: ______

Mr. Booker wants to draw attention to how well his math class is doing. Which measure of center should he use? Explain your choice.