How much would a 10th dog have to weight for the average weight in part (a)
to be 250 pounds? explain how you determined your answer.
my dogs weghts are 6, 23, 20, 65, 55, 72, 53, 16, and 18.

2,172 pounds

Explanation:

Since we should calculate the weight of the tenth dog, and we have the number of the average for all of them together, as well as the wights for the other nine dogs, we can easily come to the result.

The average weight should be 250 pounds, and it should be the average wight for 10 dogs, so we just multiply these two numbers:

250 x 10 = 2,500

We have a total weight of 2,500 pounds. Now we have to sum up the weights of the nine dogs and then minus it from the 2,500 pounds:

6 + 23 + 20 + 65 + 55 + 72 + 53 + 16 + 18 = 328

2,500 - 328 = 2,172

We get a result that the tenth dog should weight 2,172 pounds in order for the average to be 250 pounds.