Test and analysis: (1) Calculate according to the figure.
(2) Total number × percentage of healthy tree planting promotion.
(3) The total number of students participating in physical exercise × percentage; If the growth rate is X, there is an equation. After two years, the number of people participating in physical exercise will increase to 968.
Problem analysis: (1)240+60=300 (person),
Xiaoming surveyed 300 students this time.
(2)240×97.5%=234 (person);
Among the students who took part in physical exercise, 234 people's health index improved.
(3) Because the percentage of holiday exercise is:
∴ It is estimated that the number of people who take part in physical exercise during holidays in this school is: 1000×80%=800.
Let this growth rate be x, then from the meaning of the question, you get
800×( 1+x)2=968，
The solution is x=0. 1 or x=-2. 1 (truncation).
The annual growth rate is 10%.