The question is as below, the question require to use the numbers in {28.88,7.31,2.47,1.74,20.62,17.38,8.52,6.72,29.35,42.86} to estimate and . Might use R language.

Question:

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{28.88,7.31,2.47,1.74,20.62,17.38,8.52,6.72,29.35,42.86} is a sample from a normal population with mean

and standard deviation . It is already known that the standard deviation is either 15, 20 or 25. By

the maximum likelihood (ML) method estimate and .

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