Math Quiz: NYT Learning Network

Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network.  My latest contribution, a Test Yourself quiz-question, can be found here:

https://learning.blogs.nytimes.com/2012/02/27/test-yourself-math-feb-27-2012/

This problem is based on the unlikely emergence of basketball star Jeremy Lin.  How unlikely was his inaugural 7-game winning streak?