SOLUTION: The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper is normally distributed with population mean of 320 and population standa

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Question 1113599: The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper is normally distributed with population mean of 320 and population standard deviation of 20 inches.
Referring to Scenario 6-1, for a randomly chosen Monday the probability is 0.1 that there will be less than how many column inches of classified advertisements?
Answer by stanbon(75887) About Me  (Show Source):
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The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper is normally distributed with population mean of 320 and population standard deviation of 20 inches.
Referring to Scenario 6-1, for a randomly chosen Monday the probability is 0.1 that there will be less than how many column inches of classified advertisements?
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Find the z-score with a left tail of 0.1
z = invNorm(0.1) = -1.2816
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Find the corresponding column inches using x = z*s+u
Ans:: x = -1.2816*20+320 = 294.37 inches
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Cheers,
Stan H.
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