What is 12.791 rounded to the nearest hundredth

Can someone show me the steps to solve the problem?

What is a rational number between 9.5 and 9.7

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.