To find the average number of children in a family, we need to calculate the mean or the expected value.
Let's start by calculating the number of children for each category of families:
- 20% of families have three children, so the total number of children in this category is 20% * 3 = 0.2 * 3 = 0.6 children per family.
- 30% of families have two children, so the total number of children in this category is 30% * 2 = 0.3 * 2 = 0.6 children per family.
- 40% of families have one child, so the total number of children in this category is 40% * 1 = 0.4 * 1 = 0.4 children per family.
- 10% of families have no children, so the total number of children in this category is 10% * 0 = 0 children per family.
Now let's calculate the average number of children by adding up the total number of children in each category and dividing it by the total percentage:
Average number of children = (0.6 + 0.6 + 0.4 + 0) / 100% = 1.6 / 100% = 0.016 children per family.
Therefore, on average, there are approximately 0.016 children per family in the European country.