Chet plans an experimental investigation to see how well a new fertilizer works on daisies. the fertilizer must be dissolved in water and delivered to the plants by spraying it onto the leaves and stems. to set up his control group for the experiment, chet should leave out the air. water. daisies. fertilizer.

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).