Suitable chart showing any variations in the overall mean? can someone help

[leini]

Hello guys. I have CW in data analysis and I am kind of stuck in this point.... Include suitable charts illustrating any variations in the overall mean management score according to (i) whether the firm is a multinational or not; (ii) type of ownership; (iii) size of firm (as measured by the total weekly labour hours across all employees, i.e. EMP*HOURST). 
The whole assignment is examining Management Practices and Sales . I have find the overall mean and made a histogram. What i need to do in order to obtain chart for showing variation i think is computing the variables EMP*HOURST and make a diagram but it doesn't work this way. Am i supposed to recode variables into different or divide the variable size of firms(EMP*HOURST) into groups for example small, medium, big firms and how can i do this ? 
I would be happy if someone help me !
Thank you

[Quant_Liz_Lemon]

This isn't a stats homework forum. Try reddit