The correct answer is D. all of the mentioned.
Quantiles are points that divide a rank-ordered data set into equal parts. The three most common quantiles are the median (the 50th percentile), the first quartile (the 25th percentile), and the third quartile (the 75th percentile).
The quantile function is a mathematical function that takes a data set as input and returns the quantiles of the data set as output. The quantile function can be used to calculate the median, first quartile, third quartile, and any other quantile of a data set.
The quantile function is a powerful tool for data analysis. It can be used to identify the central tendency of a data set, to identify the spread of a data set, and to identify outliers in a data set.
The quantile function is also used in many statistical tests. For example, the t-test and the z-test both use the quantile function to calculate the test statistic.
The quantile function is a versatile tool that can be used for a variety of data analysis tasks.