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Normal Curve Review Flashcards | StudBud
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Normal Curve Review
Normal Curve Review
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1
The weights of healthy ten week old kittens are ~N(24.5 oz, 5.25 oz). What percent weigh less than 16 oz?
-1.61
9.23%
1.61%
5.37%
2
The area under a normal distribution curve is
.1
there
1
100
3
What does invnorm on the calculator help you find?
area
mean
proportion
z-score
4
What are the percentages outlined by the empirical rule?
50-75-100
68-95-99.7
30-60-90
45-45-90
5
The lifespans of tigers in captivity are ~N(22.4, 2.7).Use the Empirical Rule to determine the % that live < 25.1 years.
68%
84%
75%
95%
6
All of these ARE characteristics of the normal distribution curve EXCEPT?
Most of the data is away from the mean
Only has 1 peak: unimodal
Bell Shaped
Symmetric about the mean
7
The SAT Math scores are ~N(500, 100). What score falls at the 80th percentile?
580
555
840
584
8
Liz's height has a z score of -2. Jose is 71 inches tall and the heights of boys are ~N(66, 3.2). Who is more unusual?
Liz
Jose
9
For what purpose would you use the normalcdf function?
To find a z-score
To find the mean
To find a standard deviation
To find a %, proportion, or area under normal curve
10
If a Normal model has the mean of 200, which standard deviation will cause the peak to be the highest?
N(200, 10)
N(200, 50)
N(200, 15)
N(200, 20)
