In a certain large document, typing errors occur at random and at a constant mean rate of $$$0.2$$$ per page. Find the probability that there are fewer than 3 typing errors in 10 randomly chosen pages. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

Mathematics

IGCSE&ALevel

CAIE

Exam No：9709_w21_qp_62 Year：2021 Question No：5(a)

Answer:

$e^{-2}\left(1+2+\frac{2^{2}}{2 !}\right)$
$0.677(3 s f)$

6.1.1 use formulae to calculate probabilities for the distribution $\text { Po }(\lambda)$