Why is the product of different from the product of ?

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.

What is the frequency of the sinusoidal graph?

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?