Respuesta :
Answer:
0.5933
Step-by-step explanation:
Given that results from a marijuana drug test study showed 143 subjects with positive test results including 24 false positive results. There were 157 negative​ results, including 3 false negative results.
This can be tabulated as follows:
      Used Marijuana   Not used Marijuana   Total
Results
Positive    143-24 =119      24              143
Negative      3            154              157
Total        122           178              300
We have to find that probability that a randomly selected subject did not use​ marijuana
Required prob = total people not used/total people
= [tex]\frac{178}{300} \\=0.5933[/tex]
The probability that a randomly selected subject did not use​ marijuana is 0.09.
It is given that
Total subjects to be tested = 143+157 = 300
Number of genuine positive test results = 143-24 = 119
Number of genuine negative results = 157-3 = 154
Total number of false (positive + negative) results = 24+3 =27
As we know that false results are the ones that didn't use marijuana.
What is probability?
It is all about describing possibilities in numbers.
So, the probability that a randomly selected subject did not use​ marijuana will be =number of false results/ total subjects =  [tex]\frac{27}{300} = 0.09[/tex]
Therefore, the probability that a randomly selected subject did not use​ marijuana is 0.09.
To get more about probability visit:
https://brainly.com/question/24756209
