four equal parts of data.
three equal parts of data.
five equal parts of data.
Quartiles are the values that divide an ordered data set into four (approximately) equal parts. It is only possible to divide a data set into exactly four equal parts when the number of data of values is a multiple of four.
There are three quartiles. The first, the lower quartile (Q1) divides off (approximately) the lower 25% of data values. The second quartile (Q2) is the median. The third quartile, the upper quartile (Q3), divides off (approximately) the upper 25% of data values.
Percentiles are the values that divide an ordered data set into 100 (approximately) equal parts. It is only possible to divide a data set into exactly 100 equal parts when the number of data values is a multiple of one hundred.
There are 99 percentiles. Within the above limitations, the first percentile divides off the lower 1% of data values. The second, the lower 2% and so on. In particular, the lower quartile (Q1) is the 25th percentile, the median is the 50th percentile and the upper quartile is the 75th percentile.
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