To find out how many ounces Daniela drank on Sunday, we need to subtract the total amount she drank during the week from the sum of the amounts she drank each day.
Total ounces drank for the whole week = 381 oz.
Amount drank Monday to Saturday = 64 + 50 + 60 + 54 + 39 + 66 = 333 oz.
Amount drank on Sunday = Total ounces drank for the whole week - Amount drank Monday to Saturday
Amount drank on Sunday = 381 - 333
Amount drank on Sunday = 48 oz.
Therefore, the Sunday bar on her graph should be 48 oz. tall.