Algebra II : Probability
Study concepts, example questions & explanations for Algebra II
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Example Questions
Example Question #6 : Mean, Standard Deviation, And Normal Distribution
In a normal distribution, what percentage is covered within one standard deviation?
50%
68%
95%
34%
99.7%
68%
By drawing a bell curve, the middle line is 50%. One standard deviation left and right of the middle line is 34% each. That means one standard deviation within is 68%.
Example Question #7 : Mean, Standard Deviation, And Normal Distribution
If the mean is 
Two standard deviations means to double the standard deviation value.
This means the range is 
Only 
Example Question #8 : Mean, Standard Deviation, And Normal Distribution
Ibram was paid $5000 for editing a 2200-page encyclopedia. What was his rate earned per page?
$0.44
$1.27
$2.27
$0.56
$2.27
This question is really just asking for the average dollar per page. This could be easily calculated:
However, you might also think of this as a rate problem:
D=RT
Using the information from the question, we can see that D=5000 and T=2200.
This comes out to what we solved above:
Example Question #2 : Mean, Standard Deviation, And Normal Distribution
Standard Deviation can be calculated from what statistical term?
Range
Median
Quartile
Variance
Mode
Variance
Another way to calculate standard deviation is the square root of variance.
Variance is,
Taking the square root of this is how standard deviation can be calculated.
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