Final answer:
The median is seven. Quartiles separate the data into quarters.
Step-by-step explanation:
The median is seven. Half of the values are smaller than seven and half of the values are larger than seven.
Quartiles are numbers that separate the data into quarters. Quartiles may or may not be part of the data. To find the quartiles, first find the median, or second, quartile. The first quartile, Q₁, is the middle value of the lower half of the data, and the third quartile, Q3, is the middle value, or median, of the upper half of the data.
To get the idea, consider the same data set: 1, 1, 2, 2, 4, 6, 6.8, 7.2, 8, 8.3, 9, 10, 10, 11.5