T.DIST(x, degrees_freedom, cumulative)

Returns the probability of getting less than or equal to a particular value in a t distribution (left tailed).

xThe number from the distribution.
degrees_freedomThe number of degress of freedom.
cumulativeThe type of function to use:
True = cumulative probability function (less than)
False = probability density function (equal to)

Remarks

* Added in Excel 2010.
* This function replaces the TDIST function and to make it more consistent with the NORMDIST function.
* T.DIST.RT was added in Excel 2010 to replace this function when "tails" = 1.
* T.DIST.2T was added in Excel 2010 to replace this function when "tails" = 2.
* The t distribution is a continuous distribution.
* If "degrees_freedom" < 1, then #NUM! is returned
* If "degrees_freedom" is not numeric, then #VALUE! is returned.
* If "cumulative" = True, then the area under the curve to the left of "x" is returned. This uses the cumulative probability function.
* If "cumulative" = False, then the height of the curve at "x" is returned. This uses the probability density function.
* If "x" < 0, then #NUM is returned.
* If "x" is not numeric, then #VALUE! is returned.
* For the Microsoft documentation refer to support.office.com

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