Cumulative frequency
Descriptive statistics · Mathematics
Study notes
Q: Frequencies: 5(4), 6(4), 7(5), 8(5), 9(2). Find cumulative frequencies and the median. cf: 5->4, 6->8, 7->13, 8->18, 9->20. n = 20, median position = (20+1)/2 = 10.5th value. 10th and 11th values: cf reaches 13 at marks 7, so both are 7. Median = 7.