In the following exercises, write a
Average Write a program that allows scores to be input one at a time, and then displays the average of the scores upon request. (See Fig. 3.30.) The user should type a score into the top text box and then click on the Record button. This process can be repeated as many times as desired. At any time, the user should be able to click on the Calculate button to display the average of all the scores that were entered so far. Note; This program requires two class-level variables.
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