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Duplicate of Normal Distributions Review Flashcards | StudBud
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Duplicate of Normal Distributions Review
Duplicate of Normal Distributions Review
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Normal Distributions Intro
Flashcards
13 cards
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Practice quiz
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Questions
13
Answers
1
What percentage of the population is within two standard deviations of the mean?
95%
50%
99.7%
68%
2
What is the formula for finding the z-score of a value?
z = (σ - μ)/𝒙
z = (μ - 𝒙)/σ
z = (𝒙 - μ)/σ
z = μ - σ
3
What percentage of the population is within three standard deviations of the mean?
68%
99.7%
75%
95%
4
Find the probability of z occurring in the shaded region under the standard normal curve.
0.0214
0.9786
0.0107
0.9893
5
All of these are characteristics of the normal distribution curve EXCEPT?
Bell Shaped
Only has 1 peak: unimodal
Symmetric about the mean
Most of the data is away from the mean
6
Find the probability of z occurring in the shaded region under the standard normal curve.
0.0968
0.8485
0.9032
0.1515
7
Find the probability of z occurring in the shaded region under the standard normal curve.
0.5122
0.0122
0.4878
0.5244
8
The total area under a normal distribution curve is...
3
1
100
0
9
What is the z-score if the standard deviation is 10, the mean is 50, and the value is 30?
5
2
-5
-2
10
What does this symbol represent in statistics?
Standard Deviation
Mean
Normal Distribution
Population
11
What does this symbol represent in statistics?
Mean
Standard Deviation
Normal Distribution
The letter O waving
12
What percentage of the population is within one standard deviation of the mean?
99.7%
25%
68%
95%
13
On a z-table, the shading always shades...
from the outside
from the left
from the right
in the middle
