(i)[4]
Show that the chance that an apple selected at random is graded as medium is $0.692$, correct to $3$ significant figures.
(ii)[4]
Four apples are picked at random. Find the probability that at least two of them are graded as medium.
Mathematics 9709 · AS & A Level · Continuous random variables
Continuous random variables — practice question
The masses of apples sold by a store may be represented by a normal distribution with mean $120$ grams and standard deviation $24$ grams. Apples with weight below $90$ grams are labelled ‘small’; apples with weight above $140$ grams are labelled ‘large’; all others are labelled ‘medium’.