u=2.7 minutes
sigma=.6 minutes
my main question is how do I get the Z value here?
The question is something like this what is probability that the total
check out time for next customers is less than 90 minutes?
- I understand that Xi is (i=1,2,3) and
W = X1 + X2 . . . . and
P(W<90) = P(X bar<3)
BUT
How does (X bar<3) = P(Z<2.74)
So my main question is how does (X bar<3)=P(Z<2.74)?
Could someone please explain how does this work?
Thanks in advance!
.
.
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