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The Average and Standard Deviation

1 The Average and Standard DeviationMeasures of center and spread2 The AverageAverage = Mean =Sum of ObservationsNumber of ObservationsThe MedianThe middlemost number in the list3 What s the Average Salary?The Median Salary?4125,000+ 60,000+ 2 x 24,000+ 3 x 15,000+ 12,000+ 7 x 10,000 Average Salary Median Salary15 people, so 8th is middlemost$12,000= 360,000$360,00015= $24,000510 20 30 40 50 60 70 80 90 100 110 120 125 The mean is the balance median is the middlemost depend on the proportionsList: 5, 5, 8: 63183253855= + =++=AverageIf there were 20 5 s and 10 8 s would the Average be the same?

Baseball Salaries The average salary of players during a recent baseball strike was reported to be $1.2 million. The median salary was ... American League On-Base Percentages 2001 Mean, Median, SD? 36. 37 Sample of 1000 Average = 70.2 SD = 3.1 min= 60.8 max= 78.6 Sample of 100 Average = 69.7 SD = 3.2 min = 62.3

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