Online
Normal Distribution Calculator
This calculator for Normal distribution asks to enter three parameters:
the known mean of your distribution, its standard deviation and the
value you want to explore. In return, the outputs will be the frequency
and the probability of the value under study.

Normal
Distribution 
The
shaded area represents the probability of "x’"
and its frequency is "y".
The
normal probability is approximated using the following formula:
probability
= 1 – r(a_{1}t + a_{2}t^{2} + a_{3}t^{3})
+ eps
where:
a_{1}
= 0.4361836
a_{2}
= 0.1201676
a_{3}
= 0.9372980
^{}
t
= 1/(1 + 0.33267x)
eps
< 10^{5}
Example:
The
average frequency of a certain type of computers
in manufacturing is 2 GHz.
The known standard deviation is 0.02 GHz. If the frequency of
those computers is normally
distributed, what
is the probability that a computer runs between 2 GHz and 2.01
GHz?
Run the calculator below
and enter...
Enter mean: 2
Enter std. deviation: 0.02
Enter variable: 2.01
The output is
Frequency = 0.3521
Probability = 0.6915
Please,
enable JavaScript codes on this page, otherwise the calculator will not
work.


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