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Suppose you know that the amount of time it takes your friend Susan to get from...

Suppose you know that the amount of time it takes your friend Susan to get from her residence to class averages  50 minutes, with a standard deviation of 55 minutes. What proportion of Susan's trips to class would take more than  50 minutes? . Enter your answers accurate to two decimal places.

What proportion of her class would take more than  50 minutes?

What proportion of Susan's trips to class would take less than 40 minutes?

What proportion of Susan's trips to class would take more than  50 minutes or less than  40 minutes?

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