BU127 Lecture Notes - Lecture 1: Interquartile Range, Quartile, Central Tendency
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Steps in determining the location of a percentile. Determine the location by either (a) or (b). (a) if is a whole number, the th percentile is the average of the value at the th location and the value at the location. (b) if is not a whole number, the th percentile value is located at the whole number part of. Determine the 30th percentile of the following eight numbers: 14, 12, 19, 23, 5, 13, 28, 17. For these eight numbers, we want to find the value of the 30th percentile, so and. First, organize the data into an ascending-order array. Next, compute the value of is not a whole number, use step 3(b). The 30th percentile is located at the third value. Note that a percentile may or may not be one of the data values, is as in.
