(a(i))[3]
Find the standard deviation of the amount of fibre in a packet.
(a(ii))[2]
Kate buys $12$ packets of cereal. Find the probability that at least $1$ of the packets contains more than $190$ grams of fibre.
Mathematics 9709 · AS & A Level · Continuous random variables
Continuous random variables — practice question
For a packet from a particular brand of cereal, the fibre content is normally distributed with mean $160$ grams. $19\%$ of packets of cereal contain more than $190$ grams of fibre.