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in tilton school there are 380 students in key stage 3 240 students in key stage 4 110 students in key stage 5 Phoebe is carrying out of a survey she needs a sample of 100 students stratified by key stage work out the number of students from keystage 3 there should be in the sample

Answer :

Answer:

52

Step-by-step explanation:

There are 380 key stage 3 students

Total number of students is 730

380/730 x 100 = 52.05479452

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The total number of students in the stratified sample which will be from key stage 3 will be the percentage of the number of students in key stage 3 to the total number of students. Hence, 52 students should be selected from key stage 3

  • Key stage 3 = 380
  • Key stage 4 = 240
  • Key stage 5 = 110

Total number of students :

  • (380 + 240 + 110) = 730 students

Number of students which should be from key stage 3 can be calculated thus :

  • (380 / 730) × 100 = 52.05

Therefore, 52 students should be selected from key stage 3.

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