The CPU is the Central Processing Unit which is the heartbeat of the computer because it controls all the functions and activities of the computer.
Lower bound is a situation in computational analysis that has to do with the ability of a computer system to retrieve the index of the first element in an array.
Average case is the amount of time that it would take for a process to access resources above all available inputs.
Upper bound is the situation where a processor is able to fetch the last element in an array
Please note that your question is incomplete and as a result of this, i gave a general overview which should help you get the correct answer.
As a result of this, we can see that the CPU is very important and without it, the computer would not be able to function.
Read more about arrays here:
https://brainly.com/question/19240819
