Measures of Central Tendency, Variance and Percentage.

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Presentation transcript:

Measures of Central Tendency, Variance and Percentage

Mean The average of a set of scores Add all scores together, then divide by the total number of scores Ex: ÷ 5 = 81.6 (mean)

Median The middle number in a set of scores (when listed in numerical order) Ex: 60, 76, 82, 93, 97 If there is an even number of scores, add the middle two together and divide by two (average the middle two numbers) Ex: 60, 76, 82, 84, 93, =166÷2=83 (median)

Mode The most frequently occurring number in a set of scores Ex: 60, 76, 82, 82, 93 There can be more than one mode Ex: 60, 76, 76, 82, 93, 97, 97, 98,100

Range The measure of points between (and including) the lowest and highest scores Subtract the lowest score in a data set from the highest score and add 1. Ex: 60, 76, 82, 93, point range

Percentage What percentage (%) of this set of scores are A’s (90-100)? 60, 76, 76, 82, 87, 93, 97, 97, 98, 4 out of 9 scores are A’s #of A’s × 100 ÷ total # of scores 4 × 100 ÷ 9 = 44.44%