Caution, it depends a lot on child and place. DS did not spend much, but he was in London, walked everywhere, does not drink, and his social life was focused on campus, and involved cheap things like films and gaming. His flat cooked, he took packed lunches in, and he would come home to collect Amazon parcels and have a roast dinner.
Poor DD ended up with the same amount, with a 14 week term, large sports subs and kit (including a blazer!), two initiations, and expensive text books. Her accommodation is some distance from campus, she has long teaching hours, and social life is off campus, and seems to be mainly pubbing/clubbing. Food stealing in her flat is pretty rife, and dd essentially has to buy milk every day as it disappears. She reckoned that she only managed to get three bowls out of the three packets of (deliberately cheap) cereal I bought her a couple of weeks back. One boy went as far as to suggest she got something nicer next time. She spent her last money with ingredients for a batch cook of chili con carne to see her through to the end of term, but was beginning to sound like a jungle celebrity faced with rice and beans. I relented last night and transferred the money for an immediate take away plus some salad ingredients.
It will even out as she won't have the same expenses next term, and the third term is very short. So she should have a contribution towards her summer. And we are paying for her ski trip.
She is the only one she knows who has not had to take out a student loan, something she wants to keep quiet about, so she seems happy to be as broke and frugal as the others. She is far more worried about one girl whose parents keep bailing her out, and who therefore has too much money to spend on addictive substances, and who can afford to run with a rather dodgy and moneyed group.