How many people will walk into your business without any advertising or promotion?

If anyone knows anything about statistics, can you kindly help?
Say you open a new sandwich shop that people know nothing about (how good the food is, customer service, prices, etc)., however, you have great visible signage.Then, say this sandwich shop is located in a metropolitan downtown area like New York or Chicago that has pedestrian traffic of 19,000 people per day. Okay, now how many people out of those 19,000 that pass by from 7am - 5pm would likely stop in your business. Thank you for your help.
50 minutes ago - 3 days left to answer.

You will have plenty to test your product (good time to work out the bugs in the operation)
If you deliver....good product, reasonable time..
Traffic will continue and grow

not many

That's about 32 people per minute, every minute of that 10 hour day. Sounds kind of high even for a very busy place.

That said, a few will, but most would probably go someplace for lunch that they knew something about. Something like a sandwich type board outside showing specials, and prices, might help - but with 32 people a minute passing by, there might not be room for that.

Location, location, location!
I just don't understand why someone would want to open a sandwich shop, and not advertise?

I would say less than one percent or less than 190 people will try your sandwich shop in the first week of operation.

You must have a very good product coupled with excellent
and fast service before your regular clientele grows.