A state wildlife service wants to estimate the mean number of days that each licensed hunter actually hunts during a given season. They plan to construct a 95% condence interval for the mean using it i- ZQ/QSE, where S E denotes the standard error of CE, and they want the margin of error to equal 2 days. If data collected in earlier surveys have shown a to be approximately equal to 10 days, how many hunters must be included in the survey