The value of the first quartile is = 6
Calculation of first quartile
The first quartile can be calculated arranging the data and finding the median of the first lower figures.
The given set of numbers arranged from smallest to the highest number is:
3, 5, 5, 6, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 10, 10, 10, 10, 11
The first lower data are,
3, 5, 5, 6, 6, 6, 7, 7, 8, 8,
The median of the given data are two numbers which is 6+6/2 = 6.
Therefore, the value of the first quartile is = 6
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