Measures of Central Tendency. Mean, Median, Mode. mean – also known as the arithmetic mean or average. Calculated by adding the scores and dividing by the number of scores median – the number in the middle when the data is arranged in ascending or descending order
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is the mean of a set of sample values
is the mean of all values in a population
mean from a frequency table
1. Compute the mean, median, and mode for the following 10 incomes:
$10,000 $8,000 $7,000 $5,000 $7,000 $1,000,000 $9,000 $11,000 $8,000 $11,000
mean = $107,600; median = $8,500; mode = not one mode.
The mean is influenced by extreme scores (either low or high). Sometimes so much that it does not serve well as a typical value.
Mean: 420/7 = 60 (average daily intake of fat for 2000 calorie/day should be 65!)
Find the mean = 70.8, median =71, mode = 72.