Find delivery time that all deliveries are less
A pizza delivery service delivers to a campus dormitory. Delivery times follow a normal distribution with mean 20 minutes and standard deviation 4 minutes.
Question: Find the delivery time that 20% of all deliveries are less than.
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Delivery times follow a normal distribution with mean 20 minutes and standard deviation 4 minutes. Find the delivery time that 20% of all deliveries are less than.
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Now change the score of X=8 to X=18, and find the new mean and standard deviation. Describe how one extreme score influences the mean and standard deviation.
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