A grocery store buys oranges from two different farmers. The mean weight of farmer A's oranges is 8 oz. The mean weight of farmer B's oranges is 9.1 oz. The MAD of both data sets is 2. What can you infer about the two sets of oranges?
A. The MAD is large.
B. The data sets are very different.
C. There is no difference between the sets of oranges.
D. The mean is small.

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?