9.1-9.3

What shape is a normal distribution curve?

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

What is the the total area under a normal distribution curve?

• 100

• 25

• .5

• 1

Between what two standard deviations of a normal distribution contain 68% of the data?

• one below and one above
• two below and two above
• two below and zero
• zero and two above

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CCSS.HSS.ID.A.4

According to the empirical rule, what percentage of data falls within 2 standard deviations?

• 25%

• 68%

• 95%

• 99.7%

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CCSS.HSS.ID.A.4

The mean GPA of students in a course at UCDavis is 3.2 with a standard deviation of 0.3.

About what percent of students in the course have a GPA between 2.9 and 3.8?

• 81.5%

• 47.5%

• 68%

• 95%

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CCSS.HSS.ID.A.4

The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.

About what percent of the products last between 12 and 15 days?

• 68%

• 34%

• 16%

• 2.5%

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CCSS.HSS.ID.A.4

The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.

About what percent of the products last 6 days or less?

• 68%
• 34%
• 16%
• 2.5%

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CCSS.HSS.ID.A.4

Given a normal distribution of test scores with a mean of 75 and a standard deviation of 7, about what percentage of scores are greater than 68?

• 34%

• 84%

• 95%

• 68%

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CCSS.HSS.ID.A.4

The distribution of heights of adult American men is approximately normal with mean 69 inches and standard deviation 2.5 inches.

About what percent of men are between 64 and 66.5 inches tall?

• 50%

• 2.5%

• 13.5%

• 34%

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CCSS.HSS.ID.A.4

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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CCSS.HSS.ID.A.4