(3) 48,000

Test analysis: (1) According to the figure 1, randomly select the number of people who spend more than 1 hour in school every day, and there is a right angle of the circle.

Randomly select 520 graduating students, then the number of people who exercise more than 1 hour in school every day randomly selected by the school =

=390?

(2) The number of people who exercise less than 1 hour every day = 520-390 =130; As can be seen from Figure 2, among the 520 graduating students randomly selected, 50 students don't like to exercise, 10 people don't exercise for other reasons, and 130-50- 10 = 70 people have no time to exercise.

70

? (3) It is estimated that there are about = 64,000× = 64,000× = 48,000 junior high school graduates who exercise more than 1 hour every day this year.

A: It is estimated that this year's junior high school graduates in this city will exercise more than 1 hour every day.

There are about 48,000 students.

Comments: The key to solve this problem is that candidates can recognize bar charts and fan charts. This kind of question is relatively simple, and candidates will definitely do it.