In order to understand students' extracurricular activities, a proofreader surveyed the distribution of people who participated in four extracurricular interest groups: painting, calligraphy, dance an

In order to understand students' extracurricular activities, a proofreader surveyed the distribution of people who participated in four extracurricular interest groups: painting, calligraphy, dance and musical instrument. Solution: (1)∵ There are 90 people in the painting group, accounting for 45%.

∴ Total =90÷45%=200(2 points);

(2) The number of musical instrument groups =200-90-20-30=60,

Drawings (as follows) (4 points)

The central angle of the calligraphy part is: 20200× 360 = 36 (6 points);

(3) Painting needs a tutor 1000×45%÷20=22.5≈23 (name) (7 points)

Calligraphy needs tutor 1000× 10%÷20=5 (name) (8 points)

Dance teacher1000×15% ÷ 20 = 7.5 ≈ 8 (name) (9 points)

Musical instrument needs tutor 1000×30%÷20= 15 (name). (10)