Hi! To estimate you just have to average the probability of the computer game responding "go" when a button is pressed. For the first one, the button responded "go" 8 out of 10 times, which gives it a probability of 80%. For the second one, the probability is 32/50 or 64%, while the third one is 67/100 or 67%.
Averaging this we'll get:

Since we're just estimating, we can choose the value closest to 70%.
ANSWER: G. 67%