SOLUTION: 4) The amount of Jen’s monthly phone bill is normally distributed with a mean of $50 and a standard deviation of $10. Find the 25th percentile.
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-> SOLUTION: 4) The amount of Jen’s monthly phone bill is normally distributed with a mean of $50 and a standard deviation of $10. Find the 25th percentile.
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Question 682799: 4) The amount of Jen’s monthly phone bill is normally distributed with a mean of $50 and a standard deviation of $10. Find the 25th percentile. Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! The amount of Jen’s monthly phone bill is normally distributed with a mean of $50 and a standard deviation of $10. Find the 25th percentile.
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Find the z-value with a left tail of 25%:
invNorm(0.25) = -0.6745
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Find the corresponding phone bill using x = z*s+u
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x = -0.6745*10 + 50 = $43.26
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Cheers,
Stan H.
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