a) At a faculty, there are 4000 university students in the first grade, 3000 in the second grade, 2000 in the third grade and 1000 in the fourth grade. If we want to draw a layer sample of 500 students, where each layer is represented in this sample according to its size, calculate the number of students in each layer in the sample.
200, 150, 100, 50
MR/Nasef.N
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