Question: For the distribution of the sample proportion which approximates a normal distribution, it should meet: np >=5 and n(1-p)>=5 But some textbooks or online sources

For the distribution of the sample proportion which approximates a normal distribution, it should meet: np >=5 and n(1-p)>=5 But some textbooks or online sources may use >=10 or 15 instead, may I know which one should I use

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