A complex electronic system is built with a certain number of backup components in its subsystems. One subsystem has four identical components, each with a probability of 0.25 of failing in less than 1,000 hours. The sub system will operate if any two of the four components are operating. Assume that the components operate independently. (Round your answers to four decimal places.) (a) Find the probability that exactly two of the four components last longer than 1,000 hours

do you have answer choice

Step-by-step explanation:

answer: the answer is one of

step-by-step explanation:   we are given to write a proper fraction where the whole is divided into an even number of equal parts less than ten, and an odd number of those parts exist.

an even number less than 10 may be one of 2, 4, 6 or 8. so, the whole may be one of these four evens.

now, an odd number of these parts must exist, so the numerator must be an odd number, one of 1, 3, 5 or 7. it cannot be 9 because then the fraction will become improper.

thus, our fraction may be one of the following

853.3

step-by-step explanation: