Concept explainers
To estimate: the mean and standard deviation of the normal density curve
Answer to Problem 46E
The mean is 10 and the standard deviation is 2
Explanation of Solution
Given:
Calculation:
The mean lies in the middle of the graph.
The standard deviation is the horizontal distance between the graph and the mean, at a height of slightly more than half the height of the graph.
Then we note:
The mean is at about 10.
The standard deviation is about 2.
From the graph we can observe that the inflection points are 8 and 12.
Thus,
Using the below equation we get the standard deviation.
Conclusion:
Thus,the mean is 10 and the standard deviation is 2
Chapter 2 Solutions
The Practice of Statistics for AP - 4th Edition
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