The Lakeside Coffee Shop morning customer load follows a normal distribution. The mean number of customers is 60 and the standard deviation is 15. If the store gets more than 70 customers, they need to have a fourth staff member working. What is the probability that they will need a fourth person tomorrow? Include evidence of your work by typing out your solution fully.
Let the number of customers:
Given
The probability that they will need a fourth person tomorrow is 0.2525.
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