To directly answer the question: The median household income for California is $60833(http://quickfacts.census.gov/qfd/states/06000.html). The average household has 2.89 people. As a single person, you have more money to spend than most families in the state. The odds of your survival are high.

To answer your implicit question: I think you are asking "Can I survive and save some money earning 72K in California while keeping up with the Joneses(tech-savvy urbanites in Silicon Valley or LA tech scene). Yes you can. In fact, I rented a room in a large house in SV with full access to everything(kitchen, living room, backyard, bathroom etc...) for under $900/month. My roommates were people from LinkedIn, Cisco, etc... Worst case food scenario is you spend $15/meal, 3meals/day, and 31 days/month... $1400/month food. Add $100/month bill for your iDevice. Add $100/month for a monthly public transportation pass. Add $1000/month for the do-whatever-the-fuck-I-want fund.

With these covered, you are spending $3500/month, or $42000/year.

Assume your take home will be $50k post-tax. You are saving about 8k/year and living a pretty lavish life for an austere single person.