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Continued
Continued Since about 68% of the scores are between 390 and
Since 590, this leaves 32% of the scores outside this interval.
Since a bellshaped curve is symmetric, onehalf of the
scores, or 16%, are on each end of the distribution. The
figure above shows these percentages What does a smaller σ (or s) imply on a normal curve?
What Last Example:
Last The army reports that the distribution of head
The
circumferences among male soldiers is
approximately normal with mean 22.8 inches and
standard deviation 1.1 inches.
1. What percentage of soldiers have a head
1. What
circumference between 21.7 and 23.9
circumference
2. A circumference of 25 inches would be what
circumference
percentile?
percentile?
3. What % have a head greater than 25? Homework:
Homework:
Read and take notes textbook pp. 102 – 111
Do # 1 & 4
Complete worksheet
“Normal Curves Class
Normal
Exercises”
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This document was uploaded on 03/30/2014 for the course MATH AP Statist at Richard Montgomery High.
 Winter '13
 Jessell
 Normal Distribution

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