Bill wants to find the average height of students in the 11th grade at East High School. So he will use the heights of 5 th students in the 11 grade to find the average height. Answer the questions below. (a) Which unit(s) could be used for the unit of measurement? Check all that apply. kilograms milligrams centimeters grams millimeters (b) Which of the procedures below would be the best way to find the average height? th Ask for 50 volunteers from the 11 grade to state their own heights. th Measure the heights of 50 volunteers from the 11 grade. Randomly pick 50 students from the 11th grade and measure their heights. th Randomly pick 50 students from the 11" grade and have them state their own heights.