Normal Distributions

This is the graph for a normal distribution.

• True

• False

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CCSS.HSS.ID.A.4

What is another common name for a normal distribution graph?

• Half curve/graph

• Round curve/graph

• Bell curve/graph

• Square curve/graph

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CCSS.HSS.ID.A.4

The percentile represents the....

• percent of data values that are below.

• percent of data values that are above.

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CCSS.6.SP.B.5C

Find the mean of these numbers:
5,11,2,12,4,2

• 5.2

• 6
• 4.5
• 4

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CCSS.6.SP.B.5C

Using the graph- What is the mean and standard deviation?

• Mean= 125 Stan Dev= 7.5

• Mean= 133.5 Stan Dev= 8.5

• Mean= 125 Stan Dev= 9.5

• Mean= 125 Stan Dev= 8.5

Using the graph, what is the probability of selecting a value between 99.5 and 142?

• 97.35%

• 95%

• 83.85%

• 75.5%

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CCSS.HSS.ID.A.4

Find the area of the shaded region.

• 16%

• 47.5%

• 68%

• 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

If a random data value were picked, what is the probability it would land in the interval.

• 97.35%

• 95%

• 81.5%

• 49.85%

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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