Final answer:
The average drop volume in a graduated cylinder is calculated by adding water up to the 1 ml mark, counting the drops, and then dividing 1 ml by the number of drops recorded.
Step-by-step explanation:
To measure the volume of liquid and to calculate the average drop volume in a graduated cylinder accurately, you need to zoom in on the markings of the cylinder carefully. When adding drops of water to the 1 ml mark, it's important to count each drop and to make a reading at the meniscus, which is the lowest point of the curved surface of the liquid. To calculate the average volume, divide the total volume (1 ml) by the number of drops you've counted. Record this number in your lab data sheet. The accuracy of this method can depend on how well the graduated cylinder is calibrated and your precision in making the measurements.