Statistics
posted by Nadia .
Marks: /20 What percentage of the general US population have bachelor's degrees? The Statistical Abstract of the United States (120th edition), gives the percentage of bachelor's degrees by state. For convenience, the data are sorted in increasing order.
17, 18, 18, 18, 19, 20, 20, 20, 21, 21
21, 21, 22, 22, 22, 22, 22, 22, 23, 23
24, 24, 24, 24, 24, 24, 24, 24, 25, 26
26, 26, 26, 26, 26, 27, 27, 27, 27, 27
28, 28, 29, 31, 31, 32, 32, 34, 35, 38
Find the interquartile range

Interquartile range = middle 50%
You have 50 scores arranged in order of value. 25th percentile is between 12th and 13th score, and the 75th percentile is between 37th and 38th score. What is the range for these two points? 
20

50%

kjk