Test analysis: (1) According to the stem leaf diagram, there are 10 students with excellent physique, so the excellent rate is: the total number is multiplied by the excellent rate to get the total number of excellent students. (2) According to the stem leaf diagram, among these 30 students, there are 10 students with excellent physique and 15 students with good physique. Therefore, the proportion of students with excellent physique and good health in the sample is. The characteristic of stratified sampling is that each layer is sampled in proportion, so three of the five people selected have good physique and two have excellent physique. The probabilities in (i) and (II) belong to the classical probability type, so it is enough to find the total number of basic events and the number of basic events included in the request event by examples.
Problem analysis: Solutions: (i) According to sampling, it is estimated that the number of students with excellent physique in Grade Three in our school is 0.3.
(2) According to the meaning of the question, the ratio of the number of students with good physique to the number of students with excellent physique.
So the number of students with good physique is, and the number of students with excellent physique is. 6 points
(1) Among the selected 0 students, the students with good physique are, and the students with excellent physique are.
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