Select the scenario which is an example of simple random sampling. Answer Tables Keypad Keyboard Shortcuts Half of the working-age population in the county is under 35 years old, and another half is over 35 years old. The county administration wants to estimate the mean O salary for the two age groups, so they select 500 working-age residents that are younger than 35 and 500 working-age residents that are older than 35 and ask them about their salary. A mobile network operator wants to determine the mean age of its most active subscribers. A random sample of subscribers with the number of text messages O exceeding 30 per day was chosen. City managers want to find out the public's opinion of a newly reconstructed road. They use a local TV station to encourage citizens to make a call to their hot line and O share their experience. Two friends conducted a survey among their schoolmates to find out how much time schoolchildren spend reading books during the summer