The number looks close.
BTW why do you know it is wrong? You have the suggested solution?
no i know the binomial distribution.. and i tried to solve it and got this answer 90.15% but its wrong !!!
The number looks close.
BTW why do you know it is wrong? You have the suggested solution?
the right is 92.07 ??????
right answer **
Yes I have verified that answer 92.07% in R once by normal approximation. Do you know how to do?
opps how did u find this,
i feel that some information missed here
A Binomial(n, p) random variable is distributionally equal to the sum of n independent and identically distributed Bernoulli(p) random variables.
By Central Limit Theorem, if such independent sum minus its mean, and then divided by its standard deviation, then this standardized sum will converge to a standard normal distribution.
Usually the factorials in Binomial pmf is difficult to evaluate when n is large. So this approximation is useful, especially when the computer power is not so great in the past.
help101 (12-11-2011)
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