Allstate Actuarial Analyst interview questions

One specific interviewer has this question and tends to use it a lot so I'm told: You own 2 restaurants. The cumulative amount of customers in the first 3 weeks are as follows: Restaurant A: 100, 200, 1500 Restaurant B: 250, 750, 1500 You are about to open a 3rd restaurant . Predict what amount of customers the first week will hold. Explain how you came up with that answer. explain any assumptions you use in your analysis