The average waiting time at the checkout counter for a large grocery chain is 2.45 minutes with a standard deviation of 24 seconds (0.40 minutes).Assume that the distribution of waiting time is normal.What proportion of the customers are served in between 1 minute and 2.5 minutes?

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The Answer of The average waiting time at the checkout counter for a large grocery chain is 2.45 minutes with a standard deviation of 24 seconds (0.40 minutes).Assume that the distribution of waiting time is normal.What proportion of the customers are served in between 1 minute and 2.5 minutes?

The Average Waiting Time at the Checkout Counter for a Large