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Americans receive an average of 19 Christmas cards each year. Suppose the number of Christmas cards is normally distributed with a standard deviation of 6.

Americans receive an average of 19 Christmas cards each year. Suppose the number of Christmas cards is normally distributed with a standard deviation of 6. Let X be the number of Christmas cards received by a randomly selected American. Round all answers to 4 decimal places where possible.

d. 68% of all Americans receive at most how many Christmas cards? (Please enter a whole number)

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