62 



Indiana University Studies 



TABLE 18. — To Estimate Degree of Difficulty at Which 

 20 Per Cent of Errors and Omissions Would be 

 Found From any Given Percentage of Er- 

 rors AND Omissions Between 8.0 and 40.00 



Given 





Given 





Given 





Given 





per- 



Add 



per- 



Add 



per- 



Add 



per- 



Sub- 



centage 





centage 





centage 





centage 



tract 



8.0 



8 . 4 



12 . 0 



4.9 



16.0 



2 . 3 



20 . 0 



0.0 



1 



8 . 3 



1 



4 . 9 



1 



2 . 2 



1 



0 . 0 



2 



8.2 



2 



4 . 8 



2 



2 . 1 



2 



0 . 1 



3 



8. 1 



3 



4.8 



3 



2 . 1 



3 



0.1 



4 



8.0 



4 



4.7 



4 



2.0 



4 



0.2 



5 



7.8 



5 



4.6 



5 



2 . 0 



5 



0.3 



6 



7.8 



6 



4.5 



6 



1 . 9 



6 



0 . 3 





7.7 



7 



4.5 



7 



1 . 8 



7 



0 . 4 



8 



7.6 



8 



4 . 4 



8 



1 . 8 



8 



0 . 4 



9 



7.5 



9 



4.3 



9 



1 . 7 



9 



0.5 



9.0 



7.4 



13.0 



4.2 



17. 0 



1 . 7 



21 . 0 



0.5 



1 



7.3 



1 



4 . 2 



1 



1 . 6 



1 



0 . 6 



2 



7.2 



2 



4 . 1 



2 



1 . 5 



2 



0 . 6 



3 



7. 1 



3 



4.0 



3 



1 . 5 



3 



0.7 



4 



7 . 1 



4 



3 . 9 



4 



1 . 4 



4 



0.7 



5 



7.0 



5 



3 . 9 



5 



1 . 4 



5 



0.8 



6 



6.9 



6 



3 . 8 



6 



1 . 3 



6 



0. 8 



7 



6.8 



7 



3.7 



7 



1 . 2 



7 



0.9 



8 



6.7 



8 



3.7 



8 



1 . 2 



8 



0.9 



9 



6.6 



9 



3 . 6 



9 



1 . 1 



9 



1 . 0 



10.0 



6.5 



14.0 



3. 6 



18.0 



1 . 1 



22.0 



1.0 



1 



6.4 



1 



3.5 



1 



1 .0 



1 



1 . 1 



2 



6.3 



2 



3.5 



2 



1.0 



2 



1 . 1 



3 



6 2 



3 



3 4 



3 



0 9 



3 



1 2 



4 



6.2 



4 



3.3 



4 



0.9 



4 



1.2 



5 



6.1 



5 



3.3 



5 



0.8 



5 



1.3 



6 



6.0 



6 



3.2 



6 



0.8 



6 



1.3 



7 



6.0 



7 



3.1 



7 



0.7 



7 



1.4 



8 



5.9 



8 



3.0 



8 



0.7 



8 



1.4 



9 



5.8 



9 



3.0 



9 



0.6 



9 



1.5 



11.0 



5.7 



15.0 



2.9 



19.0 



0.5 



23.0 



1.5 



1 



5.7 



1 



2.8 



1 



0.5 



1 



1.6 



2 



5.6 



2 



2.7 



2 



0.4 



2 



1.6 



3 



5.5 



3 



2.7 



3 



0.3 



3 



1.7 



4 



5.4 



4 



2.6 



4 



0.3 



4 



1.7 



5 



5.3 



5 



2.6 



5 



0.2 



5 



1.8 



6 



5.2 



6 



2.5 



6 



0.2 



6 



1.8 



7 



5.2 



7 



2.4 



7 



0.1 



7 



1.8 



8 



5.1 



8 



2.4 



8 



0.1 



8 



1.9 



9 



5.1 



9 



2.3 



9 



0.0 



9 



1.9 



