# Manuals/calci/TDIST

TDIST(Number,DegreeOfFreedom,Tail),

• is the numeric value to find the distribution.
• is the degrees of freedom.
• is the number of tails.
• TDIST(),returns the Student t-distribution.

## Description

• This function gives the value of the T-Distribution.
• It is the continuous probability distributions.
• The T-Distribution is also called Students T-Distribution.
• This is the symmetric distribution like the Normal Distribution.
• It is used when making inferences about a population mean when the population standard deviation is not known.
• In , is the numeric value to find the value of the distribution.
• is the integer which is indicating the number of degrees of freedom and is indicating the number of distribution tails.
• Suppose Tail=1, then this distribution is One-Tailed Distribution and Tail=2, then this is Two-Tailed Distribution.
• Also Tail=1, then it is calculated as , where is a random variable that follows the T-Distribution.
• And Tail=2, then it is calculated as .
• This function will return the result as error
```     1. Any one of the argument is non-numeric.
2. DegreeOfFreedom<1 and Number<0. When we are giving DegreeOfFreedom and Tail as a decimals, then it is changing in to integers.
```

## Examples

1. =TDIST(1.82,55,1) = 0.037101192599
2. =TDIST(1.82,55,2) = 0.074202385199
3. =TDIST(5.9812,75,1)= 3.50350792266e-8
4. =TDIST(5.9812,75,2) = 7.007015845328e-8
5. =TDIST(2.4579,20.4,1) = 0.011612360861779858
6. =TDIST(2.4579,20.4,1.2) = 0.011612360861779858

TDIST