As a general rule, one can use the normal distribution to approximate a binomial distribution whenever np is at least 5.

Name: As a general rule, one can use the normal distribution to approximate a binomial distribution whenever np is at least 5.
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The normal distribution can be used to approximate a binomial distribution when both np and n(1-p) are at least 5, ensuring the distribution is symmetric enough for the approximation to be valid.

As a General Rule, One Can Use the Normal Distribution