A truck maker finds out that 20% of its truck transmissions on a certain model are defective and tells dealers to have owners bring the trucks in. A local dealer sold 7 of the trucks and has two new transmissions on hand. What is the probability that they need to get more transmissions? I thought that 20% of 7 is 1.4 and they alreadt have 2 but someone else said it was related to binomials and I was confused. HELP!