Answer:
The probability that exactly one switch is good is

Step-by-step explanation:
The probability that a switch is defective is:

The probability that a switch is not defective is

Therefore, if two switches are selected, the probability that exactly 1 is good is:



10*5+10*5*1 I think this is the right way
The answer is C because u multiply 16.50 and .20
(3/4*4)+(3/4*-x)= (3)+(-3/4x) = -3/4x+ 3