Mark is listening as his roommate lists 14 things that they need to buy for their apartment before the end of the week. Based on George Miller’s research into the capacity of short-term memory, if Mark doesn’t write the items down as he hears them, he is most likely to remember:

Between five and nine items from the list

Explanation:

Mark is listening as his roommate lists 14 things that they need to buy for their apartment before the end of the week. Based on George Miller’s research into the capacity of short-term memory, if Mark doesn’t write the items down as he hears them, he is most likely to remember BETWEEN FIVE AND NINE ITEMS FROM THE LIST