Suppose that a brand of lightbulb lasts on average 2875 hours with a standard deviation of...

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math Statistics-And-Probability

Answer 1

Answer #1

t - Normally distributed M = 2878 hrs a=205 hrs 2=8-M H-2875 205 z = 2826-2875 22= 3396 2875 2.54 --0.24 ; 205 205 P128262233

Answer 2

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