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

Name: As a general rule, one can use the normal distribution to approximate a binomial distribution whenever nπ is at least 5.
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The rule of thumb for using the normal distribution to approximate a binomial distribution is that both nπ and n(1-π) should be at least 5, where n is the number of trials and π is the probability of success.

As a General Rule, One Can Use the Normal Distribution