SR Unit 2 Final Review
Flashcard
•
Mathematics
•
10th - 12th Grade
•
Practice Problem
•
Hard
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15 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. It is calculated as (X - μ) / σ, where X is the value, μ is the mean, and σ is the standard deviation.
2.
FLASHCARD QUESTION
Front
How do you interpret percentiles in a data set?
Back
A percentile indicates the relative standing of a value in a data set. For example, being in the 85th percentile means that the value is higher than 85% of the data points.
3.
FLASHCARD QUESTION
Front
What is the mean in a normal distribution?
Back
The mean is the average of all data points in a distribution and is the center point of a normal distribution curve.
4.
FLASHCARD QUESTION
Front
What does standard deviation measure?
Back
Standard deviation measures the amount of variation or dispersion in a set of values. A low standard deviation means that the values tend to be close to the mean.
5.
FLASHCARD QUESTION
Front
What is the total area under a normal distribution curve?
Back
The total area under a normal distribution curve is equal to 1, representing the total probability of all outcomes.
6.
FLASHCARD QUESTION
Front
How do you find the 10th percentile in a normal distribution?
Back
To find the 10th percentile, you can use the z-score corresponding to 0.10 in the standard normal distribution and apply the formula: X = μ + (z * σ).
7.
FLASHCARD QUESTION
Front
What is the formula for calculating a z-score?
Back
The formula for calculating a z-score is z = (X - μ) / σ, where X is the value, μ is the mean, and σ is the standard deviation.
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