SOLUTION: A bank teller takes a mean of 2 min with a standard deviation of 30 s to serve a client. Assuming that there is at least one client waiting at all times, what is the probability t

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Question 876388: A bank teller takes a mean of 2 min with a standard deviation of 30 s to serve
a client. Assuming that there is at least one client waiting at all times, what is the probability that the teller will serve at least 25 clients in 1 h?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
mean = 2, sd = .5
P(z > .4/.5) = P(z > .8) = 1 - P(z ≤ .8) = 1 - .7881 = .2119 0r 21.19%