Question

$df=-----$

Short answer

The degree of freedom$df=8$.

Step-by-step solution

Given Information

Given data:

$\begin{array}{|lllll|}\hline \text{Traveling Distance}& \text{Third class}& \text{Second class}& \text{First class}& \text{Total}\\ 1-100\text{miles}& 21& 14& 6& 41\\ 101-200\text{miles}& 18& 16& 8& 42\\ 201-300\text{miles}& 16& 17& 15& 48\\ 301-400\text{miles}& 12.00\%& 14& 21& 47\\ 401-500\text{miles}& 6& 6& 10& 22\\ \text{Total}& 73& 67& 60& 200\\ \hline\end{array}$

Explanation

The number of columns is $3$and the number of rows is $5$

$df=(\text{number of column}-1)·(\text{number of row}-1)$

$=(3-1)(5-1)$

$=2·4$

$=8$