Software upgrade times (in minutes) are being evaluated. Five samples of six observations ( n=6 ) each have been taken, and the results are as listed. A. Calculate the mean for each sample (x-bar) and the grand mean (the average of all the means, x-double-bar). (Round your sample means and grand mean to 2 decimal places.) Sample 1 mean: Sample 2 mean: Sample 3 mean: Sample 4 mean: Sample 5 mean: Grand mean: B. Calculate the range for each sample (R) and the average range of the samples (R-bar). (Round the R-bar value to 2 decimals.) Sample 1R: Sample 2R : Sample 3 R: Sample 4 R: Sample 5R