Excel 2010 Conditional Formatting Cell color based on a group of text cells

Hi I need help with changing the color of a cell based on the Text values in the cells below it. So say B1 is the cell i want to change. B2-B7 has text values 'Yes', 'No', 'In Progress' I want to set this up so if 4 out of 6 has 'No' B1 changes to a red color and vice versa if 'Yes' It changes to green. Can someone help me with this?

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