Question

The mean weight of the packages Joan shipped was 2.5 pounds. If Joan mailed four packages and three of them had weights of 1.7, 3.2, and 2.8 pounds, then what did the other package weigh?

Answer 1

answers
2.3
2.8
3.3

Answer 2

Hmm this is like the 5th~ statistic question you are asking. I am not sure if you are just asking for the answers or actually willing to learn, as all the questions revolve around the same concept of mean and median. But i give you the benefit of doubt, it is pointless for me to try to analyze your intentions and i honestly do hope that you do learn something after everyone tediously explain, in great detail, the workings and the answers to you.

Moving on to the question....

GIven the mean is 2.5 pounds for 4 packages.

The total weight for all 4 packages will be given by 2.5* 4 = 10 pounds.

To find the weight of the last package,
Subtract the weight of the given packages from the total weight of all the packages,

10 - 1.7 - 3.2 -2.8 = 2.3

Weight of the last package is 2.3 pounds.