I am having trouble finding the solution to this question.

find the average height. Ivanna wants to find the average height of students in the 11 grade at Northside High School. So she will use the heights of 44 students in the 11 grade to Answer the questions below. (a) Which unit(s) could be used for the unit of measurement? Check all that apply. feet pounds ounces centimeters ) kilograms (b) Which of the procedures below would be the best way to find the average height? O Ask for 44 volunteers from the 11"grade to state their own heights. Measure the heights of 44 volunteers from the 11 grade. O Randomly pick 44 students from the 11 grade and measure their heights. Randomly pick 44 students from the 11" grade and have them state their own heights