Quartiles and interquartile range

1. 1.
   Find the interquartile range of: 4, 7, 8, 12, 16, 23, 23, 28
2. 2.
   Find the lower quartile (Q1) of: 1, 7, 15, 20, 21, 23, 24, 25, 26, 29, 30
3. 3.
   Find the lower quartile (Q1) of: 4, 7, 8, 9, 12, 14, 26
4. 4.
   Find the interquartile range of: 10, 11, 13, 18, 23, 26, 26
5. 5.
   Find the lower quartile (Q1) of: 3, 8, 11, 12, 13, 19, 23, 28, 28, 29, 30
6. 6.
   Find the lower quartile (Q1) of: 3, 6, 14, 16, 17, 21, 29
7. 7.
   Find the upper quartile (Q3) of: 5, 7, 9, 19, 25, 26, 29
8. 8.
   Find the upper quartile (Q3) of: 4, 4, 4, 9, 10, 14, 14, 16, 22, 26, 30
9. 9.
   Find the interquartile range of: 7, 8, 9, 11, 18, 20, 22, 27
10. 10.
    Find the lower quartile (Q1) of: 2, 5, 12, 13, 16, 18, 19, 23
11. 11.
    Find the lower quartile (Q1) of: 1, 2, 3, 10, 11, 17, 24
12. 12.
    Find the lower quartile (Q1) of: 1, 4, 6, 7, 18, 20, 20
13. 13.
    Find the lower quartile (Q1) of: 5, 11, 15, 15, 17, 17, 22, 25
14. 14.
    Find the interquartile range of: 3, 4, 13, 13, 25, 28, 29
15. 15.
    Find the upper quartile (Q3) of: 3, 12, 13, 16, 18, 22, 29
16. 16.
    Find the upper quartile (Q3) of: 2, 4, 6, 8, 16, 22, 24, 25, 28, 29, 30
17. 17.
    Find the interquartile range of: 4, 7, 12, 17, 17, 18, 19
18. 18.
    Find the upper quartile (Q3) of: 7, 8, 18, 24, 27, 27, 29
19. 19.
    Find the interquartile range of: 4, 5, 10, 13, 17, 19, 28
20. 20.
    Find the upper quartile (Q3) of: 6, 7, 8, 9, 15, 18, 19, 22

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