An energy company graphs the average number of rotations that a windmill makes each minute for 4 minutes. Which statement describes what the point (1, 12) means in terms
of rotation and minutes? (1pts.)

Windmill Rotations
A. 1 rotation occurs every 12 minutes.
B. 1/12 of a rotation occurs every minute.
48
C. The windmill rotates 12 times in 1 minute.
42+
D. The windmill rotates 12 times in 12
36+
minutes
30+
Number of Rotations
24+
18+
12+
6+
2 3 4 5
Time (minutes)

Each of the following data sets has a mean of x = 10. (i) 8 9 10 11 12 (ii) 7 9 10 11 13 (iii) 7 8 10 12 13 (a) without doing any computations, order the data sets according to increasing value of standard deviations. (i), (iii), (ii) (ii), (i), (iii) (iii), (i), (ii) (iii), (ii), (i) (i), (ii), (iii) (ii), (iii), (i) (b) why do you expect the difference in standard deviations between data sets (i) and (ii) to be greater than the difference in standard deviations between data sets (ii) and (iii)? hint: consider how much the data in the respective sets differ from the mean. the data change between data sets (i) and (ii) increased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). the data change between data sets (ii) and (iii) increased the squared difference îł(x - x)2 by more than data sets (i) and (ii). the data change between data sets (i) and (ii) decreased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). none of the above