Marissa simplified the expression shown
below as follows.
10 - 25 - 6+(-2)
step 1
the number syster
-15 - 6+(-2)
-9+(-2)
-11
step 2
step 3
which of the following best describes
marissa's mistake?
a. in step 1, she should have replaced
10 – 25 with 15, not -15.
b. in step 1, she should have replaced
10 – 25 with –35, not -15.
c. in step 2, she should have replaced
-15 - 6 with +21, not -9.
d. in step 3, she should have replaced
-9 +(-2) with – 7 not -11.

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