Use the given information to find the number of degrees of​ freedom, the critical values
χ2L and
χ2R​, and the confidence interval estimate of
σ. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution.
White Blood Counts of Women
90​% ​confidence; n
=
149​, s
=
1.99 ​(1000 ​cells/
μ​L).
Question content area bottom
Part 1
df
=
148
148 ​(Type a whole​ number.)
Part 2
χ2L
=
enter your response here
​(Round to two decimal places as​ needed.)

What is χ2L?