Could someone please help me with the question using another simpler method

Could someone please help me with the question using another simpler method Example17 The mean of 5 observations is 4.4 and their variance is 8.24. If three of the observations are l, 2 and 6, find the other two observations. Solution Let the other two observations be x and y. Therefore, the series is l, 2, 6, x, y.

 

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