The following data shows the weight, in pounds, of 6 bags:

6, 4, 8, 7, 8, 9

What is the value of the mean absolute deviation of the weight of the bags, and what does it represent about the weight of a bag?

1.8 pounds; on average, weight of a bag varies 1.8 pounds from the mean of 7 pounds
1.3 pounds; on average, weight of a bag varies 1.3 pounds from the mean of 7 pounds
1.3 pounds; the weight of 50% of the bags is greater than 1.3 pounds
1.8 pounds; the weight of 50% of the bags is greater than 1.8 pounds