Given the following dataset, what is the first quartile? Round to the nearest tenth if necessary.
42, 82, 67, 34, 54, 62, 17, 47, 56, 18, 20 (1 point)
To find the first quartile, we need to arrange the dataset in ascending order first:
17, 18, 20, 34, 42, 47, 54, 56, 62, 67, 82
There are 11 numbers in the dataset, so the position of the first quartile can be calculated as:
(1/4) x (11+1) = 3
This means the first quartile is the 3rd number in the dataset, which is 20.
Therefore, the first quartile is 20.