A sample of 800 computer chips revealed that 70% of the chips fail in the first 1000 hours of their use. The company's promotional literature claimed that 73% fail in the first 1000 hours of their use. Is there sufficient evidence at the 0.10 level to dispute the company's claim?

Lin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. she knows that the total cost to download 3 videos was $12. her work to find the equation is shown below. joylin’s work step 1 k= 3/12= 0.25 step 2 y= 0.25x where did joylin make her first error?