What is (3.1 x 10^5)(2.2x10^7) in scientific notation? 5.5x10^12 6.82x10^12 5.5x10^35 6.82x10^35

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? probability distribution px(x) 6 hours 7 hours 8 hours 9 hours 10 hours 0.62 0.78 пол