Casio FX-CG10 Software User Guide - Page 206
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Center Point Center Point 1 2 3 4 5 6 7 8 9 Median 2 + 3 = Q1 2 7 + 8 2 = Q3 u OnData The Q1 and Q3 values for this calculation method are described below. Q1 = {value of element whose cumulative frequency ratio is greater than 1/4 and nearest to 1/4} Q3 = {value of element whose cumulative frequency ratio is greater than 3/4 and nearest to 3/4} The following shows an actual example of the above. (Number of Elements: 10) Data Value 1 2 3 4 5 6 7 Frequency 1 1 2 3 1 1 1 Cumulative Frequency 1 2 4 7 8 9 10 Cumulative Frequency Ratio 1/10 = 0.1 2/10 = 0.2 4/10 = 0.4 7/10 = 0.7 8/10 = 0.8 9/10 = 0.9 10/10 = 1.0 • 3 is the value of whose cumulative frequency ratio is greater than 1/4 and nearest to 1/4, so Q1 = 3. • 5 is the value of whose cumulative frequency ratio is greater than 3/4 and nearest to 3/4, so Q3 = 5. Reference Point (0.25) Reference Point (0.75) 0.1 0.2 0.4 0.7 0.8 0.9 1.0 1 2 3 3 4 4 4 5 6 7 Q1 Q3 6-13