9. Suppose a picker needs to walk from the beginning of the aisle to a location at a distance L, pick an item, and return to the beginning of the aisle. The picker walks at a speed of 2.5 meters per second and takes 10 seconds to pick the item. (a) Give an equation for the round trip travel time R as a function of L and the other data. (b) If the mean of L is 5 meters and the standard deviation of L is 3 meters, what is the mean and variance of R?

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