Answer:
3.375 pounds.
Explanation:
Total number of pounds of pecans = 
 2 1/2 pounds of pecans + 4 3/8 pounds + 3.25 pounds 
= (6.875 + 3.25) pounds
= 10.125 pounds.
 The total number of person = 3 person.
Therefore, the number of pounds each person would shell = 
10.125 pounds/3
= 3.375 pounds