The normal is a good approximation to the binomial when n is greater than or equal to 10.

Name: The normal is a good approximation to the binomial when n is greater than or equal to 10.
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The normal approximation to the binomial distribution is generally considered good if the sample size n is large (usually n ≥ 30) and both np and n(1-p) are greater than or equal to 10, where p is the probability of success.

The Normal Is a Good Approximation to the Binomial When