2 3 4 5 77.0 80.5 79.9 78.9 80.8 78.1 78.7 79.6 79.4 79.6 80.0 81.0 80.4 79.7 80.4 78.4 80.4 80.3 79.4 80.8 79.5 80.1 80.8 80.6 78.8 78.1 80.6 81.0 81.1 82.3 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 1 R: Sample 2 R: Sample 3 R: Sample 4 R: Sample 5 R: R-bar: