The sales era was 1920s-1940s
        
             
        
        
        
Answer:
The answer is "Option B".
Explanation:
Inferential statistics was its process through which data collection is used to conclude the property or even an implicit wave function. Its analysis infers these same features of inhabitants. Its purpose is to use statistical strategies to determine important assumptions regarding sample size, and  other choices were wrong which can be defined as follows:
- In option A, it defines the average of the given values, that's why it is wrong.
- In option C, It is used to0 describes a number of samples that's why it is wrong.
 
        
             
        
        
        
The answer to this is 1000
        
             
        
        
        
The answer is letter a which is central tendency. It is because this is where managers give ratings to their employees or evaluate their employees base on their performances. And usually, they provide a rating to their employees as average because of the given factors that will fall in this decision. It could be because they fall within the rage, which they had provided, having them to have average ratings.