What is the free rate for students between the ages of 5 and 17 at the school run by Kacey Gibson?
Eligible free rates for students aged 5-17 = `Free Meal Count (Ages 5-17)` / `Enrollment (Ages 5-17)`
SELECT CAST(T2.`Free Meal Count (Ages 5-17)` AS REAL) / T2.`Enrollment (Ages 5-17)` FROM schools AS T1 INNER JOIN frpm AS T2 ON T1.CDSCode = T2.CDSCode WHERE T1.AdmFName1 = 'Kacey' AND T1.AdmLName1 = 'Gibson'