Carlos has scored 83, 81, and 73 on his previous three tests. what score does he need on his next test so that his average (mean) is 83 ?

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