Jeff is playing a racing game. the game awards him an initial $4,000 of virtual money. in addition, he gets $100 of virtual money for each race he
wins. in the end, he calculates average earnings of $200 for each race he won. if i represents the number of races he won, which equation can
be used to find the number of wins?
4,000 + 2005 - 100
ob. 4,000 + 1005
oc
4,000
+ 100
= 200
= 100
= 4,000
od. 200 + 100mm

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