Can you help me find the area?

According to the data set, where should the upper quartile line of the box plot be placed?

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

The length of the line segment ac is 8x-9 what is the value of x