Normal Distribution Quiz

The distribution of heights of adult American men is approximately Normal with mean 69 inches and standard deviation 2.5 inches.  
What percent of men are taller than 74 inches?

• 2.5%
• 5%
• 16%
• 1%

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The proportion of observations from a standard Normal distribution with values less than z = 1.15 is

• .1251
• .8531
• .8749
• .8944

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The proportion of observations from a standard Normal curve with values larger than z=-.75 is

• .2266
• .7422
• .7734
• .8023

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What is the z-score value that corresponds to the 30th percentile?

• -1.02
• -.52
• .52
• 1.02

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The average waist size for teenage males is 29 inches with a standard deviation of 2 inches. 
If waist sizes are normally distributed, determine the z-score of a teenage male with a 33 inch waist.  

• 2
• 1
• -2
• -1

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The mean life of a tire is 30,000 km. The standard deviation is 2000 km.

Then, 68% of all tires will have a life between ___________ km and __________ km.

•  28,000 km and 32,000 km.
• 24,000 km and 34,000 km.
• 26,000 km and 34,000 km.
• 27,000 km and 31,000 km.

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The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees.  What is the z-score for a temperature of 17 degrees?  

• 1 
• 1.43
• -1.43
• 11.5

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The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees.  Approximately what percent of days in February will have days below 23 degrees?

• 5%
• 34%
• 50%
• 68%

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What shape is a normal distribution curve?

• Half curve
• Round curve
• Bell curve
• Square curve

The normal curve is symmetrical about the mean.

• True
• False

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