three flavors of juice are offered at a school cafeteria. the table shows the number of student who purchased each flavor during three lunch period. Based on table, what is the probability that a student who bought juice chosen at random purchase the grape flavor?​

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.