A machine used to fill​ gallon-sized paint cans is regulated so that the amount of paint dispensed has a mean of 123 ounces and a standard deviation of 0.30 ounce. You randomly select 40 cans and...

A machine used to fill​ gallon-sized paint cans is regulated so that the amount of paint dispensed has a mean of 123 ounces and a standard deviation of 0.30 ounce. You randomly select 40 cans and carefully measure the contents. The sample mean of the cans is 122.9 ounces. Does the machine need to be​ reset? Explain your reasoning.