(Modify) Modify the program written for Exercise 15 so that the number of test results f...

(Modify) Modify the program written for Exercise 15 so that the number of test results for each experiment is entered by the user. Write your program so that a different number of test results can be entered for each experiment.

Reference Exercise 15:

15. (Program) Four experiments are performed, and each experiment has six test results. The results for each experiment are given in the following list. Write, compile, and run a C++ program using a nested loop to compute and display the average of the test results for each experiment.