Pie Chart

Divide the central angle for Comedy by 360°: $90÷360=\frac{1}{4}$. Multiply by the total number of students: $\frac{1}{4}\times 80=20$ students.

Divide the number of students who chose Cycling by the total number of students, then multiply by 360°: $20÷100\times 360=72$°.

Divide the number of students who chose Blue by the total number of students and multiply by 360°: $20÷50\times 360=144$°.

The total number of students is 100. Strawberry has 25 students, so $25÷100\times 360=90$°.

The central angle for Studying is 60°. The fraction of the day is $60÷360=\frac{1}{6}$. Multiply by 24 hours: $\frac{1}{6}\times 24=4$ hours.

Basketball has a central angle of 90°, so $90÷360=\frac{1}{4}$. If $\frac{1}{4}$ corresponds to 60 students, the total is $60\times 4=240$. Volleyball has a central angle of 120°, which is $\frac{1}{3}$ of the circle. $\frac{1}{3}\times 240=80$ students.