In the Netherlands, there are on average 3 days of sun, 7 days of cloudy weather and 4 days of rain in a period of 14 days. An ice cream firm wins 65 euros a day in sunny weather, 10 euros in cloudy weather and loses 15 euros in rainy weather. Calculate the average profit per day for that company
just do the weighted sum:
3/14 * 65 + 7/14 * 10 - 4/14 * 7 = ____