Grade $428921,29885,30849,31813,32777,33741,34705,35669,36633,37597.$

Grade $532357,33436,34515,35594,36673,37752,38831,39910,40989,42068.$

What is the rate range for Grade $4?$

What is the rate range for Grade $5?$

What is the percentage grade overlap between Grade $4$ and Grade $5?$

What is the rate range for Grade $14?$

What is the rate range for Grade $15?$

What is the percentage grade overlap between Grade $14$ and Grade $15?$

Are the percentage overlaps between grades $4$ and $5$ the same as between grades$14$ and $15?$ What are the implications if the percentage overlap are not the same $$ what does it say for grades $4$ and $5$ and what does it say for grades $14$ and $15?$