To calculate the mean absolute deviation, we first need to calculate the mean of the data set:
Mean = (36 + 54 + 49 + 39 + 41 + 48 + 50) / 7 = 45
Next, we calculate the absolute deviation of each data point from the mean:
|36 - 45| = 9
|54 - 45| = 9
|49 - 45| = 4
|39 - 45| = 6
|41 - 45| = 4
|48 - 45| = 3
|50 - 45| = 5
To calculate the mean absolute deviation, we take the average of these absolute deviations:
Mean Absolute Deviation = (9 + 9 + 4 + 6 + 4 + 3 + 5) / 7 = 5.7
Therefore, the answer is option (c) 5.7.