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plz give me some explanation, thanks. X X X X are independantly and identically (i.i.d) distributed normal random variables population mean 7 and population variance

plz give me some explanation, thanks.

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X X X X are independantly and identically (i.i.d) distributed normal random variables population mean 7 and population variance 16 . The 1! 2' 3' 4 probability that the average of these four random variables lies between 5 and 9 is closest or equal to 0 0.6826 0.1587 \\/ 0 0.3174 0 0.8413

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