3 and 4 if possible please and thanks!

3. Three math classes took a quiz, and their scores are displayed in the histograms below. Which class has the largest Standard Deviation? Which class has the smallest standard deviation? Set A Set C 4. Which of the following statements is always true? a). 25% of the data is at or below the 1*t quartile mark. b). 75% of the data is at or above the 3d quartile mark. c). The median is halfway between the minimum value and the maximum value. d). The median value is halfway between the 1st and 3nd quartile marks