In a recent blog, we posted a fun, interactive map that shows all the lottery prizes of $600 or more that were claimed in February. The map brought up some good questions from folks, particularly about the patterns it revealed.
One reader wondered how there could be more winning tickets in higher-population areas when the distribution of tickets is random. The man said he thought that if ticket distribution truly was random, there would be no way that population or the sales at a particular store would matter. But simply by the math involved, they do.
Maybe these visual examples can help make things clear: 
Store A, which sells 70 tickets per week
Let’s say that each day, a particular store has 50 customers, and 20 percent of them buy a lottery scratch ticket. That means the store sells 10 tickets a day, or 70 tickets in a week. And that means there are only 70 possibilities for winning tickets from that store.
Store B, which sells 350 tickets per week
In this example, the store involved has 250 customers per day, one in five of whom buy a lottery scratch ticket. That means the store sells 50 tickets a day, or 350 tickets in a week.
Because the busier store sells more tickets, there also will naturally be more winners there. That doesn’t mean the store is luckier, it’s just a matter of sales volume.
For a store with less foot traffic, it will take longer to sell more tickets. And fewer tickets being sold overall means that fewer winning tickets will be sold.
Winning tickets are distributed randomly throughout the entire supply in any of our scratch games. And, our tickets are delivered to the 2,400 lottery retailers in Iowa in no particular order. So, there truly is no way to know when and where the next winning ticket will be purchased.
Stores that sell the most lottery tickets generally are in the biggest communities in our state simply because that’s where more people live and do business.