Final answer:
The number of transistors in a carton varies due to factors such as manufacturing processes, quality control, and packaging.
Step-by-step explanation:
In a carton of transistors, the number of transistors varies (option 2). From past experience, companies have found that the number of transistors in each carton can be different. This variation occurs due to factors such as manufacturing processes, quality control, and packaging. Therefore, it is not always the same number of transistors.