A science club chose to test the pH balance of different foods. They measured the pH balance of 7 different foods and arranged their data from least to greatest. The pH balances were 2, 3, 4, 5, 6, 7, and 8. The mean pH balance of the foods measured was 5.
What is the MAD (mean absolute deviation) rounded to the nearest tenth?
0.7
1.7
2.4
2.0