One characteristic measured about high schools is the percent free lunch, which is the percentage of the student body that is eligible for free and reduced-price lunches. The top 100 schools, grouped according to their percent free lunch, is as follows.
 

If stratified random sampling with proportional allocation is used to select a sample of 25 high schools, how many would be selected from the stratum with a percent-free-lunch value of 20 ≤ x< 30?(Round up to the nearest integer.)

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Number of top Percent free 100 lunch (x) ranked high schools 0 <x < 10 46 10 <a < 20 20 20 <a < 30 12 30 <x < 40 10 40 <a < 12 Number of top Percent free 100 lunch (x) ranked high schools 0 <x < 10 46 10 <a < 20 20 20 <a < 30 12 30 <x < 40 10 40 <a < 12

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