A juice machine is set to dispense 16 ounces of juice. The amount of juice dispensed is normally distributed, with a mean of 16.15 ounces and a standard deviation of 0.25 ounces. In which range will be amount of juice dispensed be found 95% of the time? PLEASE HELP

For a short time after a wave is created by wind , the height of the wave can be modeled using y= a sin 2pi(t) / t where a is the amplitude and t is the period of the wave in seconds. how many times over the first 5 seconds does the graph predict the wave to be 2 feet high?