
Understanding Normal Distribution and Z-Scores

Interactive Video
•
Mathematics, Science
•
9th - 12th Grade
•
Hard

Ethan Morris
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the empirical rule state about data within one standard deviation of the mean?
Approximately 50% of data falls within one standard deviation.
Approximately 68% of data falls within one standard deviation.
Approximately 95% of data falls within one standard deviation.
Approximately 99.7% of data falls within one standard deviation.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the mean and standard deviation of the standard normal distribution?
Mean is 1, standard deviation is 0
Mean is 0, standard deviation is 1
Mean is 0, standard deviation is 0
Mean is 1, standard deviation is 1
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you calculate a z-score for a data value?
Multiply the data value by the mean and divide by the standard deviation
Subtract the mean from the data value and divide by the standard deviation
Add the mean to the data value and divide by the standard deviation
Subtract the standard deviation from the data value and divide by the mean
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If a z-score is negative, what does it indicate about the data value?
The data value is equal to the mean
The data value is below the mean
The data value is at the maximum
The data value is above the mean
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the z-score for a data value of 26, given a mean of 22 and a standard deviation of 5?
0.8
1.6
0.4
1.2
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which function on the TI-84 calculator is used to find the area under the normal distribution curve?
normalcdf
normalpdf
binomcdf
invNorm
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the area to the left of the mean in a normal distribution?
0.75
1.0
0.5
0.25
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