Invalid Marks Count

Easy ★☆☆

Update the output cells so that each student's invalid marks cell displays the count of invalid marks for that student for classes they took. If a cell is blank it means the student didn't take that class. If the mark is non-numeric it means it's invalid. See Examples

Your solution should use cell references so it updates automatically if the input cells change values.

COUNT COUNTA

Hint

Solution Approach

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A1 expected value: *

To see an example of the expected output for a given cell, first click on any output cell. An option will then appear to show the expected value for that cell.

Your solution is tested against 3 test cases which you can toggle between. To pass, your solution should use cell references so it returns the correct output across test cases.