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We'll discuss the three tools the TI-83 Plus/TI-84 Plus calculators Student's T tpdf(, Calculates probability p(x) from the student's T distribution.tpdf(. computes the probability density function ( · pdf. ) for the Student-. t. distribution at a. specified. x. value. · tpdf(. to the Y= editor. The TI-83, 83+, 84 instructions for distributions and tests. Distributions TI's URL for TI assistance and instructions: ti.com tpdf(x,df). μ, σ) tpdf(x, n) ↑ degrees of freedom χχχχχ2pdf(x, n) ↑ degrees of freedom mean μ, standard deviation σ n trials, probability of success p n degrees Texas Instruments TI-84 Plus Manual Online: tpdf(, Tcdf(. Tpdf( Tpdf( Tpdf( Computes The Probability Density Function ( Tpdf( Specified Value. The TI-Basic Information Repository ; Command Summary. Evaluates the Student's t probability density function with degrees of freedom ν. ; Command Syntax. tpdf(t,