Answer:
The second one.
Step-by-step explanation:
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:



Answer:
Around 7.5
Since the shaded region is very slightly less than half, we can estimate that the answer is somewhere around or exactly 7.5 since it is half of 15.