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What percentage of calls are completed between 100 and 120 minutes with a mean time of 100 minutes for office calls with a standard deviation of 25 minutes?
Wiki User
∙ 14y ago
Mean = 100
Standard Deviation = 25
(120 -100) / 25 = 0.80
th z value of .80 from the table = .2881
P(100-120) = 28.81%
What percentage of calls are completed in less than 60 minutes ?
(60 - 100) / 25 = - 1.6
from the table the z value is .4452
(one side), then : .5000 - .4452 = .0548
P(60) = 5.48%
Wiki User
∙ 14y ago
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Percentage between 415 and 515 standard deviation 100 and mean is 515?
34.1% with the normal distribution.
Relation between mean and standard deviation?
Standard deviation is the variance from the mean of the data.
What is the difference between standard deviation and mean?
The mean is the average value and the standard deviation is the variation from the mean value.
Difference between beta and standard deviation?
* * *
Standard deviation is helpful in calculating?
Standard deviation is a calculation. It I used in statistical analysis of a group of data to determine the deviation (the difference) between one datum point and the average of the group.For instance, on Stanford-Binet IQ tests, the average (or, mean) score is 100, and the standard deviation is 15. 65% of people will be within a standard deviation of the mean and score between 85 and 115 (100-15 and 100+15), while 95% of people will be within 2 standard deviations (30 points) of the mean -- between 70 and 130.
Does standard deviation have to be between 0 and 1?
Standard deviation doesn't have to be between 0 and 1.
Percentage between 415 and 515 standard deviation 100 and mean is 515?
34.1% with the normal distribution.
What is the relationship between standard deviation and variance?
Standard deviation is the square root of the variance.
Relation between mean and standard deviation?
Standard deviation is the variance from the mean of the data.
What is the difference between standard error of mean and standard deviation of means?
Standard error of the mean (SEM) and standard deviation of the mean is the same thing. However, standard deviation is not the same as the SEM. To obtain SEM from the standard deviation, divide the standard deviation by the square root of the sample size.
How do you apply standard deviation to normal curve?
The distance between the middle and the inflection point is the standard deviation.
What is the relationship between standard deviation and variance for the same sample data?
The standard deviation is the square root of the variance.
What is the difference between standard deviation and mean?
The mean is the average value and the standard deviation is the variation from the mean value.
Difference between beta and standard deviation?
* * *
What percentage of the area falls below the mean?
The area between the mean and 1 standard deviation above or below the mean is about 0.3413 or 34.13%
What is the relationship between standard deviation and precision?
The more precise a result, the smaller will be the standard deviation of the data the result is based upon.
What is the difference between standard error and standard deviation?
Standard error is the difference between a researcher's actual findings and their expected findings. Standard error measures the accuracy of one's predictions. Standard deviation is the difference between the results of one's experiment as compared with other results within that experiment. Standard deviation is used to measure the consistency of one's experiment.
