Answer:
Jordin weighs 96 pounds
Explanation:
The Mean Value of a Data Set
The mean or average of a data set is found by adding all numbers and then dividing by the number of values in the set. Written as a formula:

Where xi is the value of each data and n is the total number of values.
We are given the average weight of n=5 marathon runners:

Multiplying the formula by n and expanding the sum:

We are given the weighs of four of the runners:


Solving for x5:

Jordin weighs 96 pounds