The following scatter plot reports the quantity of time Jayne estimates it would take to make each successive unit; the first unit was estimated to take 120 minutes, the second unit 84 minutes, and the third unit 68.18 minutes. (a1) Calculate the exact number of minutes that would be expected for the fourth unit. (Round answer to 1 decimal place, e.g. 15.2.) Number of minutes minutes (a3) What learning curve percentage is assumed in this analysis? Learning curve percentage % (a4) Would you interpret that to be a steep learning curve