Calculating z-scores
Flashcard
•
Mathematics
•
9th Grade
•
Practice Problem
•
Hard
Standards-aligned
Wayground Content
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14 questions
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1.
FLASHCARD QUESTION
Front
What is a z-score?
Back
A z-score indicates how many standard deviations an element is from the mean of a dataset.
2.
FLASHCARD QUESTION
Front
How do you calculate a z-score?
Back
Z-score = (x - mean) / standard deviation
3.
FLASHCARD QUESTION
Front
What does a positive z-score indicate?
Back
A positive z-score indicates that the data point is above the mean.
4.
FLASHCARD QUESTION
Front
What does a negative z-score indicate?
Back
A negative z-score indicates that the data point is below the mean.
5.
FLASHCARD QUESTION
Front
If the mean is 30 and the standard deviation is 5, what is the z-score for x = 35?
Back
Z-score = (35 - 30) / 5 = 1.0
6.
FLASHCARD QUESTION
Front
If the mean is 50 and the standard deviation is 10, what is the z-score for x = 40?
Back
Z-score = (40 - 50) / 10 = -1.0
7.
FLASHCARD QUESTION
Front
What is the significance of a z-score of 0?
Back
A z-score of 0 indicates that the data point is exactly at the mean.
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