19. Calculate the lower quartile from the following data.
X : 22 26 14 30 18 11 35 41 12 32
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The values in ascending order are: Median = (12th + first) ÷ 2. ...
Range = difference between the highest and lowest values. = 57 – 1. ...
Lower quartile = value of middle of first half of data Q1 = the median of 1, 11, 15, 19, 20, 24. ...
Upper quartile = value of middle of second half of data Q3 ...
Interquartile range = Q3–Q1
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