On a ranch, a rancher can place a loop of rope, called a lasso, once in every 2 throws around a cow’s neck. What is the probability that the rancher will be able to place a lasso around a cow’s neck at least once in 4 attempts? Choose one:
A) 3/4
B) 5/8
C) 7/8
D) 11/16
E) 15/16
P(missing all 4)=(1/2)^4=1/16   P(success on at least one attempt)=1-1/16=15/16   The answer is 15/16.
<result>E</result>
On a ranch, a rancher can place a loop of rope, called a lasso, once in every 2 throws around a cow’s neck. What is the probability that the rancher will be able to place a lasso around a cow’s neck at least once in 4 attempts?