Make an order of magnitude estimate of the number of light b

Make an order of magnitude estimate of the number of light bulbs in Phoenix. Need an example of work shown.

Solution

Phoenix population in 2013 was 1.5 million. Say 2 persons per household. By Googling \"light bulbs per household\" I found an article claiming that South Florida homeowners had an average of 47 light bulbs per household, but \"homeowners\" excludes apartment tenants, and may even exclude trailers, so I\'m going to say 30 instead of 47. That gets me to a total of 1.5 million x 15 = 22.5 million bulbs,