A researcher conducted a work motivation study on employees at THREE (3) companies namely Company One, Company Two and Company Three. Table 4 and Table 5 show a summary of the results of the statistical analysis of the study. Refers to table 4 answer questions (a) to (e). Table 4 : Descriptive Statistical Decisions Work Motivation Company/ Company N EX Variance Minimum Maximum ONE 240 2.000 28.00 32.00 TWO 16 590 11.050 31.00 45.00 THREE 9 357 3.250 37.00 42.00 Amount/ Total 33 28.00 45.00a. Calculate the mean value of work motivation for each group of companies. b. Calculate the standard deviation value for each group of companies. (3 marks) C. Calculate the value of the range for each group of companies. (3 marks) d. Explain the meaning of the difference in the mean value you obtained in question (a). (2 marks) e. Explain what the difference in the standard deviation value you get in question (b). (2 marks)