What is the 25th percentile (also known as the first quartile) of the following set of ungrouped data: [12, 15, 14, 10, 18, 11, 13]?

For the ungrouped dataset [7, 3, 9, 5, 2, 8, 10], which value represents the 50th percentile (median)?

In an ungrouped dataset [8, 6, 15, 4, 12, 9, 10], what value is the 75th percentile (third quartile)?

Given the ungrouped data [20, 25, 30, 15, 10, 5], which value is the 20th percentile?

For the ungrouped dataset [33, 21, 40, 25, 29, 32, 28], what is the 90th percentile?

In the ungrouped dataset [45, 55, 65, 40, 70, 50, 60], which value is the 30th percentile?

What is the 40th percentile of the ungrouped data set [5, 15, 25, 10, 20, 30, 35]?

In the dataset [11, 22, 33, 44, 55, 66, 77, 88, 99], which number represents the 60th percentile?

What is the 80th percentile of the ungrouped data set [2, 8, 4, 10, 6, 12, 14]?

In the dataset [9, 2, 5, 6, 1, 3, 4, 7, 8], what is the 70th percentile?