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jsmith613
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Homework Statement
A hardwhere store sells on average 8 drills per week.
The store receives ONE delivery of drills at the same time each week.
Find the no. of drills that need to be in stock after a delivery for there to be at most a 5% chance of the store NOT having sufficent drills to meet demand before the next delivery.
Homework Equations
The Attempt at a Solution
Ok so we know that Y≈Po(8)
where Y = no. expected to sell
lets say n = demand no.
thus we want
p(n > Y) < 0.05
so
P(Y<n) < 0.05
BUT THE ANSWER SAYS
P(Y>n) < 0.05
How is this possible
thanks