Step-by-step explanation:
I think we can choose the number 5 so
9 - 5 = 4 no more than 8 and less than 3
Answer:
The probability that both pumps will fail to work at the same time is 0.025 or 2.5%.
Step-by-step explanation:
The probability that both pumps will fail to work at the same time is the multiplication of the probabilities that the pomps fail.
That is
- the probability that the old pump fail =

- the probability that the newer pump fail =

Then, the probability that both fail at the same time is:
