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Find the expected number of cartridges per month that have less than $28.9\text{ ml}$ of this ink.
Mathematics 9709 · AS & A Level · Continuous random variables
Continuous random variables — practice question
The amount of ink in one kind of ink cartridge has a normal distribution with mean $30\text{ ml}$ and standard deviation $1.5\text{ ml}$. Staff in an office use $8$ of these cartridges each month.