T.DIST function
    T.DIST(X,
    DegreesOfFreedom, IsCumulative) T.DIST(X;
    DegreesOfFreedom; IsCumulative)
  
  X
        Number or { Number }
      
      The value at which to evaluate the function.
DegreesOfFreedom
        Number or { Number }
      
      The degrees of freedom parameter for the distribution.
IsCumulative
        Logical or { Logical }
      
      FALSE to calculate the probability density function and TRUE to calculate the cumulative distribution function.
Returns
        Number or { Number }
      
      A value for Student's left-tailed t-distribution.
Returns a value for Student's left-tailed t-distribution.
Example
      T.DIST(0.5, 2,
      TRUE)T.DIST(0,5; 2;
      TRUE)
      
    
    Returns roughly 0.7.