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.
Answers
Answered by
3
Answer:
79
Step-by-step explanation:
Answered by
2
Answer:
52
Step-by-step explanation:
dd the 3 stages for the total number of students:
380 + 240 + 110 = 730 total students.
The fraction of students in Key Stage 3 = 380 / 730
She needs a sample of 100, so multiply the fraction of Stage 3 by the sample rate:
380/730 x 100 = 52.05 people.
Since you cannot have 0.05 of a person, depending on how your teacher wants you to round you could have either 52 or 53 people.
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