Is the use of "in the range of " correct? In the third sentence, it is right for me to use "number" when the verb is "were"
The time that was devoted strictly to marketing each week was in the range of ten percent to 70%.
The number of people who worked in minority insurance agentsí office was in the range of one to eight.
The number of people who worked in minority insurance agentsí office when they started were two and four.
Welcome to Using English.
Usually you use "in the range of" for a much closer set of choices. 10%-70% is a huge spread. In the range of 60-70%, or in the range of 15-20%.
(Don't mix "ten percent" and "70%" - 10% to 70%)
At any time, the number of employees working there ranges from six to eight. (One to eight is just too big a range.)
The third sentence isn't a good one. What do you mean?
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.