bonjour

2)400/6400=0.0625

3)((800+400)/6400))x100=18.75%

4)fréquence en %:

(1250x100)/6400=19.53%

(2100x100)/6400=32.81%

(1550x100)/6400=24.22%

(800x100)/6400=12.50%

(400x100)/6400=6.25%

(300x100)/6400=4.69%

angle en degré:

(1250x360)/6400=70.3°

(2100x360)/6400=118.1°

(1550x360)/6400=87.2°

(800x360)/6400=45°

(400x360)/6400=22.5°

(300x360)/6400=16.9°

5) je te laisse faire le diagramme circulaire