Instruction 5-6 from an Inventory of 48 New Cars Being Shipped to Shipped

Short Answer

Instruction 5-6
From an inventory of 48 new cars being shipped to local dealerships,corporate reports indicate that 12 have defective radios installed.
-Referring to Instruction 5-6,what is the probability out of the 8 new cars it just received that,when each is tested,exactly half of the cars have defective radios?