binomial_rnd

[Dupuis]

Hello,

while looking at
http://en.wikipedia.org/wiki/Binomial_distribution#Mean_and_variance
it states that, for a Binomial distribution with parameters N and P,
mean = N*P
variance = N*P*(1-P)

but
z=binornd(40, .5, 1000, 1)
generates a discrete variable whose mean is far different from the expected
value of 20. Any idea ?

Regards

Pascal


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