Example 3: Calculate the range for the given frequency distribution. (b) If the ages of the group of boys and girls are combined, then the range will be: 17 4 13. Download this MATH 140 class note to get exam ready in less time Class note uploaded on Dec 15, 2016. We use an interquartile range to avoid outliers. Also, the maximum part of the data exists within the interquartile range. Solution: (a) The range for group of girls 10 6 4. (If there is no data point at 4, then the lowest point greater than 4.) Upper 1. Finding the IQR involves splitting a data set into fourths. What do we use the interquartile range for? Interquartile range, IQR Q 3 - Q 1 2 Lower 1.5IQR whisker Q 1 - 1.5 IQR 7 - 3 4. It is called the interquartile range (IQR). Taking the first half of the data, 1, 2, 3.48, 49, 50 we can find the first quartile value.įirst Quartile = \(Q_1 = \dfrac\] 8. Listing the first 100 natural numbers, we have 1, 2, 3. Peter wants to know the interquartile range of the set of the first 100 whole n umbers. How can you help Peter? \(\therefore \) The interquartile range is 28 George finds the first quartile and the third quartile values of the data to be 43 and 71 re spectively. How can you further help George to find the interquartile range for this data?
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