Normal Approximation of Binomial (Edexcel A-Level Mathematics): Quizzes

When dealing with a large number of trials

$np \geq 5$

$np \geq 5$ and $n(1-p) \geq 5$

To ensure Binomial is bell-shaped enough

$np$

$\sqrt{np(1-p)}$

Normal is continuous, Binomial is discrete

$0.5$

$P(64.5 < X < 75.5)$

$Z = \frac{x - \mu}{\sigma}$