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Mean is the average, sum total divided by total number of data entries.

Standard deviation is the square root of the sum total of the data values divided by the total number of data values.

The standard normal distribution is a distribution that closely resembles a bell curve.

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โˆ™ 2010-05-30 07:55:46
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A polynomial of degree zero is a constant term

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Q: What is the mean and standard deviations and the standard normal distribution?
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In a standard normal distribution 95 percent of the data is within plus standard deviations of the mean?

95% is within 2 standard deviations of the mean.


What percentage of scores fall within -3 and plus 3 standard deviations around the mean in a normal distribution?

99.7% of scores fall within -3 and plus 3 standard deviations around the mean in a normal distribution.


How many standard deviations is the first quartile away from the mean on a Normal distribution?

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What percentage of observations of a normal distribution is represented by the mean plus or minus 1.96 standard deviations?

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What percentage of observations of a normal distribution is reprented by the mean plus or minus 1.96 standard deviations?

The probability of the mean plus or minus 1.96 standard deviations is 0. The probability that a continuous distribution takes any particular value is always zero. The probability between the mean plus or minus 1.96 standard deviations is 0.95


What percent of the data in a normal distribution lies more than 2 standard deviations above the mean?

2.275 %


What percentage of a normal distribution is within 2 standard deviations of the mean?

I believe the standard deviations are measured from the median, not the mean.1 Standard Deviation is 34% each side of median, so that is 68% total.2 Standard Deviations is 48% each side of median, so that is 96% total.


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The mean of a standard normal distribution is 0.


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