The correct answer is 70mm
Circumference: 21.991 feet
Area: 38.485 feet
The theorical probability is 1/4, because there are 4 possible outcome, and they are equally likely to be picked (the sectors have the same area)
The experimental probability is 3/20, becuase the red sector was picked 3 times in 20 trials.
Start with the given equation:

Substitute known values:

Evaluate:

Similarly:

