This is where Excel comes in handy. There are five main functions in Excel related to the t-distribution (not including the t-test functions in the Data Analysis Toolpak T.DIST T.DIST.RT T.DIST.2T...

In which of the above functions do you INPUT a t-value and get an OUTPUT of a cumulative probability (area under the curve)? Degrees of freedom is a required input for all five functions, so you can ignore that for this question.