Can someone me solve this? given that f, g, and h are functions with values f(2)=3, g(2)=1, and h(2)=−4, and point-derivatives f′(2)=4, g′(2)=−1, and h′(2)=−3, calculate the following.

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.