Question: Code a web page to calculate average test scores entered by the user in a popup box. User should enter 999 to indicate that they

Code a web page to calculate average test scores entered by the user in a popup box. User should enter 999 to indicate that they are done entering test scores. At this time the page should display the average of the entered scores.

You can assume that the user will enter valid numbers between 0 and 100.

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