To find the estimate of the three item
We will follow the steps below:
The first package weighs 0.77 pound, this is approximately 1 pound
The second package weighs 2.9 pounds, this is approximately 3 pounds
The third package weighs 1.12 pounds, this is approximately 1 pounds
So the estimate of the total weights = 1 + 3+1 = 4 pounds