Solve the problem.
-Of the coffee makers sold in an appliance store,4.0% have either a faulty switch or a defective cord,2.5% have a faulty switch,and 0.1% have both defects.What is the probability that a coffee maker will have a defective cord? Express the answer as a percentage.
A)4.0%
B)4.1%
C)2.6%
D)1.6%

Question

Quizplus · Accepted Answer

We can use the formula:
P(defective cord) = P(defective cord only) + P(defective cord and faulty switch)
P(defective cord only) = P(defective cord) - P(defective cord and faulty switch)
P(defective cord and faulty switch) = 0.1%

P(defective cord) = 4.0% - 0.1% = 3.9%
Therefore, the probability that a coffee maker will have a defective cord is 3.9%. The closest answer choice is D) 1.6%, which is much lower than the actual probability.

Solve the Problem. -Of the Coffee Makers Sold in an Appliance Store,4.0% Have