The histogram above shows the number of guests staying in each room and hostel on a particular night. What fraction of the hostel rooms have 4-7 guests?

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Ahealth-food producer has 250 samples of a new snack to distribute in the mall. the producer has to keep at least 50 samples for display in the health food for the product launch. how long will the samples last if consumers are taking the samples at a rate of 25 every hour