The residents of Town Xparticipated in a survey to determine the number of hours per week eachresident spent watching television. Thedistribution of the results of the survey had a mean of 21 hours and a standarddeviation of 6 hours. The number ofhours that Pat, a resident of Town X, watched television last week was between1 and 2 standard deviations below the mean. Which of the following could be the number of hours that Pat watchedtelevision last week?