A group of 7th graders was asked about their favorite winter-time activity and the results were listed. The probability of a 7th grader selected, at random, preferred building a snowman was expressed as a decimal rounded to the nearest thousandth.

0.135

Step-by-step explanation:

first, find the total kids in the group

14 + 69 + 21 = 104

14 students / 104 total

14/104 = 0.13461...

rounded to the nearest thousandth is 0.135

probability for j is 1/4

while

a is 1/6

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