Find two numbers a and b such that P(a ≤ S2≤b) = 0.90.

Suppose n = 20 observations are to be taken on normally distributed LC50 measurements, with σ2 = 1.9. Find two numbers a and b such that P(a ≤ S2≤b) = 0.90. (S2 is the sample variance of the 20 measurements.)

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