13 2.55, 3.10. 2.65, 2.45, 3.25
a. The mean is
(Round to two decimal places as needed.)
b. Enter the deviation for each data item in the table below.
2.55
3.10
2.65
2.45
3.25
(Round each answer to two decimal places as needed.)
c. The sum of the deviations is I. (Round to two decimal places as needed.)

bgh

2.55 njhh

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional