Rockwell-automation Arena Basic Edition Users Guide Manuel d'utilisateur télécharger pdf (Page 77)

A • STATISTICAL DISTRIBUTIONS

• • • • •

A • Statistical Distributions

Normal(

)NORMAL(Mean, StdDev) or NORM(Mean, StdDev)

The mean (

) specified as a real number and standard deviation (

) specified as a positive

real number.

(−∞, +∞)

The normal distribution is used in situations in which the central limit theorem applies;

i.e., quantities that are sums of other quantities. It is also used empirically for many

processes that appear to have a symmetric distribution. Because the theoretical range is

from - ∞ to + ∞, the distribution should only be used for positive quantities like

processing times.

Probability

Density

Function

)2/()(

)(

σμ

πσ

−−

exf

for all real x

arame

ers

Range

Mean

Variance

Applications

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Rockwell-automation Arena Basic Edition Users Guide Manuel d'utilisateur Page 77