can you help me answer this math problem

Question

In a city of 25,000 homes, a survey was taken to determine the number with Wi-Fi access. of the 300 homes surveyed, 210 had WI-FI access. Estimate the number of homes in the city that have Wi-Fi acces

Answer 1

The basic assumption is that the 300 homes that were surveyed have the same characteristics (regarding W-Fi) that the entire population of 25,000 homes have.  This may not be true, and a statistics model allows us to calculate the confidence level of that assumption being true.

 

But, for the purpose of an initial estimate,

  "210 out of 300 have Wi-Fi access; how many out of 25,000 have Wi-Fi access?"

     210   /    300                          =      x           /     25,000

 

210/300 = x/25000

 17500 = x