lilianapena2005
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HEB cashiers spend about 7 minutes checking out a customer with a standard deviation of 2
minutes. HEB sackers take an average of 4 minutes bagging a customer's groceries with a
standard deviation of 1.1 minutes. Assuming that checking and bagging can be described using a
Normal model, what is the probability that the total time a customer waits will be under 8
minutes?

Sagot :

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