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Here's how to highlight marks using conditional formatting
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Select all the marks, go to conditional formatting, click highlight cell rules, more rules, select
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greater than or equal to, right 40 here, click on format, select this green color, click
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ok and ok again. Go to conditional formatting again, highlight cell rules, more rules, select less than
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right 40 here, click on format, select this red color, hit ok and ok again
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And there you have conditional formatting in excel