The standard deviation of the following data set is 0.31. 68% of the data would fall in which range? 4.3, 5.1, 3.9, 4.5, 4.4, 4.9, 5.0, 4.7, 4.1, 4.6, 4.4, 4.3, 4.8, 4.4, 4.2, 4.5, 4.4
A . Pr (3.88 ≤ X ≤ 5.12)
B . Pr (3.57 ≤ X ≤ 5.43)
C. Pr (4.19 ≤ X ≤ 4.81)
D .Pr (2.67 ≤ X ≤ 5.33)

Will give the box plots below show the math scores of students in two different classes: class a 55 72 75 89 95 class b 55 70 75 94 100 based on the box plots, which statement is correct? a: the median score of class a is greater than the median score of class b. b: the lower quartile of class a is greater than the lower quartile of class b. c: the upper quartile of class a is greater than the upper quartile of class b. d: the maximum score of class a is greater than the maximum score of class b.