A grand mean is calculated as the average of the means of several groups.

To calculate the grand mean, simply enter the data values for up to five groups into the boxes below, then press the “Calculate” button.

1, 2, 4, 8, 12, 13, 14, 19, 22

1, 3, 3, 5, 6, 7, 7, 12

Grand Mean: 8.02778