Level 345

The percentage of outstanding students in the total number of students in grade is 90%, 84% and 78% respectively.

The passing rate is 10% 14% 19%.

The percentage of the number of students who repeat the grade is 0.2% to 3%.

(1) Comparing the excellent rates of the students' math final exam results in three grades, you find that the excellent rates decrease with the increase of grades.

(2) There are 270 students with excellent grades in the math final exam of Grade Three, and the total number of Grade Three students is 270 ÷ 0.9 = 300.

(3) In the final math exam for the fourth grade students, the number of students who passed the exam was 238 less than those who got good grades, and the total number of students in the fourth grade was 1, 238 \ 0.84-0. 14 = 340 \ 2, assuming that there were x students in the fourth grade: 0.84x-.

(4) In the final math exam for fifth-grade students, the number of outstanding students and qualified students * * * is 29 1, and the total number of fifth-grade students is 29 1.78+0. 19 = 300.