Stats20Descriptive

# Stats20Descriptive - Untitled Document 9:39 PM Lesson 2.3...

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6/27/09 9:39 PM Untitled Document Page 1 of 2 file:///Users/bonk/Desktop/dukeonly/Stats20Descriptive.html Lesson 2.3 Mean, Median and Mode (1) Mean The mean is the same as the average. To find the mean, add all the values and divide by the total number of values. Example: {2, 3, 5, 6} The mean The letter x with a bar over it, , represents the sample mean. The Greek letter, µ , represents the population mean. Median The median is the middle value of a set of numbers that has been ordered from smallest to largest. The upper case letter M is used for the median. Example: A sample of statistics exam scores for 14 students are (in order from smallest to largest) as follows: 53, 59, 63, 63, 72, 72, 76, 78, 81, 83, 84, 84, 90, 93 Notice that 14 is an even number. The median is between 7th and 8th values (the middle two values). The 7th value is 76 and the 8th value is 78. The median M = Example: A second sample of statistics exam scores for 15 students are (in order from smallest to largest) as follows: 52, 60, 65, 67, 70, 71, 74, 76, 78, 78, 78, 80, 86, 89, 95 Notice that 15 is an odd number.

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