Application/ TIPS (must have numerical answers!) 12. The population of a school has the following approximate student breakdown: 260 grade 9, 240 grade 10, 220 grade 11 and 200 grade 12. Stratified sample of 10% is to be taken. a) What is the population size? b) What is the sample size? c) How many students of each grade are to be included into the sample?

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