There are 2140 students in a school district. In a sample of 449 students from this school district, 169 have mathematics scores below grade level. Based on this sample statistic, estimate the number of students in this school district with mathematics scores at or above grade level.
A)1402
B)805
C)280
D)1335

Question

Quizplus · Accepted Answer

The proportion of students below grade level in the sample is 169/449. To estimate the number of students at or above grade level in the entire district, first find the proportion of students at or above grade level in the sample, which is 1 - (169/449). Then, multiply this proportion by the total number of students in the district: (1 - (169/449)) * 2140 ≈ 1335.

There Are 2140 Students in a School District