60% of the class is blonde
She spent 10 minutes. 25% x 40 = 10.
If the radius of the circle is 4 than the area would be 50.27.
If you are saying that 4 is the diameter, than divide that by 2 to get the radius which is 2. The area for this would be 12.57.
I don’t know which one you mean but hope this helps :))
I think maybe 3) would make the most sense because she wants a random sample of students and the other options are specific on the type of students.