As a general rule, one can use the normal distribution to approximate a binomial distribution whenever
nu and n(u - 1) are at least 5.

Name: As a general rule, one can use the normal distribution to approximate a binomial distribution whenever nu and n(u - 1) are at least 5.
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Quizplus · Accepted Answer

This is known as the normal approximation to the binomial distribution, and the rule of thumb is that the approximation is good when np >= 5 and n(1-p) >= 5.

As a General Rule, One Can Use the Normal Distribution