The members that fished from a boat: 24 + 11 = 35 members
Members that caught fish: 24
24/35 = 0.685714286
Move the decimal place twice to the right.
0.685714286 ⇒ 68.57
Round this to the nearest tenth ⇒ 68.6
The probability that the member caught fish from a boat is 68.6%.