Quartiles from an individual series and a discrete series
Method
These are the marks obtained in Mathematics by class 10 students of Janta Secondary School in the first terminal examination: 21, 23, 28, 14, 10, 18, 19, 29, 27, 25, 19, 17, 18, 20, 21, 17, 15, 16, 28, 23, 24, 17, 16, 19, 14, 24, 23, 27, 14, 15, 21, 24, 26, 24, 18.
Write the marks as an individual series in ascending order and find the first quartile and the third quartile.
Write the same marks as a discrete series, with the frequency of each mark, and find the first quartile and the third quartile again.
Discussion
Are the first quartile and the third quartile obtained from the two series different? Discuss in pairs.
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