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Unformatted text preview: distributed random variable with mean .50 minutes and standard deviation of .05 minutes. A sample of 49 is taken. What is the probability that the sample average (from these 49 observations) is less than . 495 minutes? IEE 380 Summer 2009 Name:__________________________ Quiz #6D The viscosity of a fluid is a normally distributed random variable with mean of 1.2 centipoise and variance of .06 centipoise 2 . Thirtysix samples of this fluid are taken. What is the probability that the sample mean of these samples exceeds 1.22 centipoise? ( 29 242 . ) 7 . ( 7 . 49 05 . 50 . 495 . ) 495 . ( =Φ =< = <= < Z P n X P X P σ μ ( 29 312 . 688 . 1 ) 49 (. 1 49 . 36 06 . 20 . 1 22 . 1 ) 22 . 1 ( == Φ= = <= Z P n X P X P...
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 Summer '09
 chattin
 Standard Deviation, Variance, Probability theory, IEE

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