IF not over a certain% than Fail

[SOLVED] I have to add three columns and if the % is less than 70 I need the cell to show F (for fail) if over 70% then show the number

is it the total of three different cells in the same row or is it the total of three whole columns?
if the first, something like =if(sum(A2:C2)<.7,"Fail","Pass")

I'm assuming the three column ranges all contain percentage values.

Then something like

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Or perhaps easier to have a check cell which sums the % ranges you're interested in and then

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