6 = 8 9 10 11 12 Carmen wants to find the average height of students in the 10" grade at East High School. So she will use the heights of 35 students in the 10 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. seconds O inches hours feet minutes (b) Which of the procedures below would be the best way to find the average height? Measure the heights of 35 volunteers from the 10 grade. Ask for 35 volunteers from the 10 grade to state their own heights. Randomly pick 35 students from the 10 grade and have them state their own heights. Randomly pick 35 students from the 10" grade and measure their heights