What is a z-score?

Understanding the Standard Normal Distribution

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

Sophia Harris
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A measure of central tendency
The number of standard deviations a data value is from the mean
A measure of data spread
A type of probability distribution
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is a z-score calculated?
By adding the mean to the data value
By dividing the data value by the mean
By multiplying the data value by the standard deviation
By subtracting the mean from the data value and dividing by the standard deviation
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the mean of the standard normal distribution?
1
100
0
Depends on the data
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the standard deviation of the standard normal distribution?
1
0
Depends on the data
100
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
According to the empirical rule, what percentage of data falls within one z-score of the mean?
95%
68%
99.7%
50%
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the empirical rule state about data within three z-scores of the mean?
99.7% of data falls within this range
All data falls within this range
95% of data falls within this range
68% of data falls within this range
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the z-score for a test score of 500 if the mean is 550 and the standard deviation is 80?
1.25
0.625
-0.625
-1.25
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