Michelle has a $100.she wants to purchase paper pins ($20) and file covers ($20) and paper weights. each paper weight costs $10. how many paper weights can she purchase

Nielsen media research wants to estimate the mean amount of time (in minutes) that full- time college students spend watching television each weekday. find the sample size necessary to estimate the mean with a 15-minute margin of error. assume that a 95% confidence level is desired. also assume that the population standard deviation is known to be 112.2 minutes.