15. * The demand for white latex paint at a hardware store has always been 3, 4, 5, 6, 7, or 8 gallons per day. Over the past 300 working days, the owner notes the following frequencies of demand: Quantity 3 4 5 6 7 8 # of Days 90 30 25 75 60 20 Convert the frequency distribution into a probability mass function by calculating the probability of each possible outcome