A graph shows the survey results of a group of students who were asked how many honors classes they have to Aiken and how many elective classes how many elective classes with students likely have taken if they have taken 12 honors classes 1) 15, because y=1/2x+9
2) 12, because y=y=-1/2x+9
3)6,y=1/2x+9
4)3,because y=-1/2x+9

the required probability is 0.0071  

Step-by-step explanation:

Given the data in the question;

we have narrowed the possibilities down to 4 people, 5 weapons, and 7 rooms.

so total number of combinations for the narrowed down metrics is computed as follows;

using multiplication rule:

⇒ 4 × 5 × 7 = 140 ways

Now, the probability of making a random guess from our narrowed down choices as well as getting the guess correct will be;

⇒ 1 / 140

{ assuming that the narrowed down choices have within it the correction combination }

= 0.007142 ≈ 0.0071  { four decimal place }

∴  the required probability is 0.0071