Normal Distributions Quiz

The z-score represents.....

• the amount of standard deviations a data value is above or below the mean.
• the percentile the data value is above or below the mean.
• the amount of standard deviations a data value is above or below the median.
• the percent the data value is above or below the mean.

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

• 100
• 25
• .5
• 1

Tags

CCSS.7.SP.C.7A

Which is NOT true about the standard normal distribution?

• It is bell-shaped.
• It is unimodal.
• The mean is 0 and the standard deviation is 1.
• It is asymmetrical.

Tags

CCSS.HSS.ID.A.4

What of the following is true about this distribution?

• the mean is greater than the median

• the median is greater than the mean

• the median and mean are equal

• it is impossible to tell the relationship between mean and median without the actual data.

Tags

CCSS.6.SP.B.5D

CCSS.HSS.ID.A.2

Some normal distributions are skewed in shape.

• True

• False

What is the mean and standard deviation of this normal distribution?

• $\mu=65;\ \sigma\ =\ 10.5$

• $\mu=54.5;\ \sigma=3.5$
  

• $\mu=65;\ \sigma=3.5$

• $\mu=65;\ \sigma=21\$

Tags

CCSS.HSS.ID.A.4

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

Tags

CCSS.HSS.ID.A.4

What percentage of scores falls within 3 standard deviations of the mean?

• 68%

• 34%

• 99.7%

• 95%

Tags

CCSS.HSS.ID.A.4

Write the probability statement for the graph.

• P(x < 5.6)

• P(x > 2.9)

• P(x < 2.9 or x > 5.6)

• P(2.9 < x < 5.6)

Tags

CCSS.HSS.ID.A.4

Find the z-score with 20% of observations falling above it.

• z=-0.84

• z=1.84

• z=-1.84

• z=0.84

Tags

CCSS.HSS.ID.A.4