Zip codes are numerical designations of locations for the purpose of mail delivery. The following histogram summarizes the number, in hundreds, of zip codes assigned to each state in the United States.
A histogram plots Number of states versus Number of zip codes, in hundreds, from 0 to 24 and over, in increments of 2. There are no bars between 12 and 14, 16 and 20, and between 22 and 24. Bar heights are approximately as follows. From 0 to 2, 12. From 2 to 4, 6. From 4 to 6, 8. From 6 to 8, 9. From 8 to 10, 5. From 10 to 12, 4. From 14 to 16, 3. From 20 to 22, 2. 24 and over, 1.
Here is the five-number summary for these data:
Five-number summary
min
Q
1
Q
1
start text, Q, end text, start subscript, 1, end subscript median
Q
3
Q
3
start text, Q, end text, start subscript, 3, end subscript max
1
11
275
275275
533
533533
933
933933
2596
25962596
According to the
1.5
⋅
IQR
1.5⋅IQR1, point, 5, dot, start text, I, Q, R, end text rule for outliers, how many low outliers are there in the data set?