(i)[2]
Determine the probability that a pencil selected at random has length greater than $10.9\text{ cm}$.
(ii)[3]
Determine the probability that, in a random sample of $6$ pencils, at least two have lengths less than $10.9\text{ cm}$.
Mathematics 9709 · AS & A Level · Continuous random variables
Continuous random variables — practice question
The lengths of new pencils follow a normal distribution with mean $11\text{ cm}$ and standard deviation $0.095\text{ cm}$.