Ms. Malihan, a call center agent computed a u= 20, and the standard deviation o = 5 of the number of clients she assists in half of her working hours. Find the z value that corresponds to a score X = 12.​

i pretty sure it is

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

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.