Determine whether each graph represents a function

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.