Current location - Training Enrollment Network - Mathematics courses - (20 13? Three schools in Xiaguan District (Model No.1), A, B and C, took the eighth-grade math exam, and the teacher analyzed one of the questions.
(20 13? Three schools in Xiaguan District (Model No.1), A, B and C, took the eighth-grade math exam, and the teacher analyzed one of the questions.
(1) The total number of eighth-grade students in three schools = 400120 360 =1200;

(2) Number of students in school B = 1200× 150 360 = 500, and number of students in school C = 1200× 90 360 = 300.

∴D Total population = 400× 36.25%+500× 57.6%+300× 38% = 547,

The percentage of students whose answers are completely correct is m = 547 1200 ≈ 45.58%.

(3) A large proportion of students in C school make calculation errors, so teachers in C school should strengthen the application and mastery of calculation.