The following table lists the number of unicyclists in Corvallis, OR. by age group. Age Group Frequency
319
52
20-29 7
30-39 22
40-49 42
50-59 84
60-69
4
270
88
What is the probability that a randomly selected unicyclist from Corvallis, OR. is not
between 20 and 29?
Answer in decimal form. Round your answer to 3 decimal places.

a is the correct

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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

the answer is mp

step-by-step explanation: