According to the National Center for Education Statistics (NCES), the average undergraduate student in the United States earned \$3,100 in 2015-16. However, this figure includes both students who worked and those who did not. When looking only at students who worked, the average annual earnings were \$7,100.
In the United Kingdom, the average undergraduate student earned £11,850 in 2017-18. This figure includes both students who worked and those who did not. When looking only at students who worked, the average annual earnings were £20,800.
In Australia, the average undergraduate student earned \$24,532 in 2017-18. This figure includes both students who worked and those who did not. When looking only at students who worked, the average annual earnings were \$34,128.
It is important to note that these figures are just averages, and that there is a wide range of variation in the amount of money that university students earn. Some students may earn very little, while others may earn a significant amount of money.