I want to apply logical expression to complete column of variance to reflect health status

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Like if variance is equal or less than 30days, health status is Yellow, if variance is greater than 30 days then health status should reflect as red. And if equal to/less than 0 its green. It want to apply this expression to complete column so i would like to know the health status of each task of my project.

Trying IF and AND expressions however, it not sure where is the error.

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