Answer: 59.342
Explanation:
The chi-square critical values are used to find the confidence interval for σ.
Left critical value =
[i.e. chi-square value from chi-square table corresponding to degree of freedom n-1 and significance level of
]
To find : left critical value for 95% confidence interval for σ with n = 41.
Significance level :

degree of freedom = 41-1=40
Now, the left critical value for 95% confidence interval for σ with n = 41 is the chi-square value corresponding to degree of freedom n-1 and

=59.342 [from chi-square table ]