A school has 650 students. Each student studies one of Analytical Chemistry or Health Care or Biochemistry or Biostatistics and Epidemiology. The table shows the number of students who study each of these courses. An inspector wants to look at the work of a stratified sample of 70 of these students. Find the number of students studying each of these courses that should be in the sample.  Courses Number of Students   Analytical Chemistry 145   Health Care 121   Biochemistry 198   Biostatistics and Epidemiology 186

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