Eight minus the quotient of 2 and a number x​

Which of the following contains a variable?

One of the problems with our current election system is? ?

The human resources manager at a company records the length, in hours, of one shift at work, x. he creates the probability distribution below. what is the probability that a worker chosen at random works at least 8 hours? 0.62 0.78 0.84 0.96