1. You have the Excel data. Compare all of these three sets (case 1, 2, & 3) of data. The data has units of time and measures the time a process needs on different servers. Are the data normally distributed? Plot the histograms. b. Assume that the data are normally distributed. Plot the 'normal distribution of all three data sets on one graph. Comment on the graph. Comment on the order of the times needed for the three cases: which one takes longer and which one takes the least time. Check the correlations between Case 1, Case 2 and case 3. Can the correlation coefficien be "zero"? e