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Critical values X2L and X2R

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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