Abaseball stadium holds 15,002 seats. the lower level has 50 fewer than three times as many seats as the upper
level. the middle level has 40 more than twice as many seats as the upper level. let x represent the number of
upper-level seats
which equation represents this scenario?
x + (2x + 20) + (3x – 50) = 15,002
x+ (2x + 40) + (3x – 50) = 15,002
x + 2(20 + x) + 3(50 – x) = 15,002
x + 2(x + 20) + 3(x - 50) = 15,002

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