Critical values X2L and X2R

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Use the given information to find the number of degrees of freedom, the critical values X2L,and X2R the confidence interval estimate of sigma ?. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution.Nicotine in menthol cigarettes 95% confidence; s= 0.24 mg.Please show me a way to get the answer in Excel. Or way to set it up. I need a way to solve future problems.

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