Test analysis: This question examines the comprehensive application of bar chart and fan chart. Reading statistical charts and obtaining necessary information from different statistical charts are the key to solving the problem. Bar charts can clearly show the data of each project. The pie chart directly reflects the percentage of this part in the population. According to the data provided by bar chart and fan chart, each item can be calculated separately.
Answer? =200 (name) and the sample size is 200, so this option is correct; B, the number of people in Grade A is: 200×60%= 120 (person),
The number of people in D is 200- 120-50-20= 10 (people), and the central angle of the sector where D is located is 360× = 18, so this option is wrong; In sample C, the percentage of Grade C is 65,438+0-60%-25%-= 65,438+00%, and D. There are about 65,438+0,500× 60% = 900 students in the whole school, so this option is correct.