To find out approximately how many hours its residents are spending playing cards at a senior retirement home, the recreation director conducts a random survey. the table below shows the number of hours per week these randomly selected seniors play cards. hours seniors play cards senior citizen hours played joe 6 mary 2 bert 8 frank 11 elizabeth 10 janet 9 what is the estimated number of hours all seniors at this retirement home play cards, the population mean, based on the sample and rounded to the nearest whole hour? 7 hours 8 hours 9 hours 10 hours