Question 199873
I'm not sure why you want to add in Pennsylvannia. They just want to know the probability of selecting someone who is NOT from California. Are you missing part of the question? Anyways....




Number of people who do NOT live in California = Number people in US - Number of people who live in California



Number of people who do NOT live in California = 293,655,404 - 35,893,799 = 257,761,605


So 


Number of people who do NOT live in California = 257,761,605



"What is the probability that a randomly selected US resident did not live in California? "



So the probability of selecting a US resident that does NOT live in California is...



P(NOT California) = # who do NOT live in California/# total 


P(NOT California) = 257,761,605/293,655,404


P(NOT California) = 0.877769



So the percentage is 87.7769% which rounds to 87.777% (to the nearest thousandth of a percent).