Arrange data in chronological order from least to greatest.
11, 13, 14, 18, 20, 23, 24, 28
The five number summary in a box plot are the following
1) minimum - 11
2) Q1 - 13.5
3) Q2 - 19
4) Q3 - 23.5
4) maximum - 28
IQR = Q3 - Q1 = 23.5 - 13.5 = 10
Range = maximum - minimum = 28 - 11 = 17
Pls. see attachment for the boxplot
