Whether you use the mean or the median depends on lots of factors (including your instructor’s preferences), but in general, don’t use the average if you have outliers. The median is resistant to outliers the middle of this set is 26: in between the 22 and 40. The arithmetic mean has the distinct disadvantage of being extremely influenced by outliers -very small, or very large data points. Divide Step 1 by the number of items in your set (9): 2450 / 9 = 271.11.You can use this formula to get to the exact same answer as in the problem above:Įxample: Find the average: 210, 230, 240, 260, 280, 290, 300, 310, 330. Here, the letter n is used to represent the number of items. The summation sign (Σ) means to “add up”. More formally, the formula is written as: Average = total sum of all the numbers / number of items in the set.
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