At a local community the department of health has the following table reporting
ID: 2906699 • Letter: A
Question
At a local community the department of health has the following table reporting the number of people with or without symptoms, and those tested positive or negative of having an infectious disease. For some reasons some numbers were erased. Every member of the community has been tested.
Symptoms
No Symptoms
Total
Positive
450
650
Negative
1250
Total
550
2000
Complete the table above.
Given that an individual is tested negative what is the probability that this individual has the disease (has symptoms)?
At a public school it is reported that 64% of students own a personal computer. 3 Students are randomly selected.
What is the probability that all of them has a personal computer?
What is the probability that at least one of them does not have a personal computer?
Symptoms
No Symptoms
Total
Positive
450
650
Negative
1250
Total
550
2000
Explanation / Answer
Ans:
a)
P(symptoms/negative)=P(symptoms and negative)/P(negative)
=100/1350
=0.0741
2)Given that
n=3,p=0.64
a)P(all of them have personal computer)=P(x=3)=0.64^3=0.2621
b)P(atleast one does not have personal computer)=1-P(all of them have personal computer)
=1-0.2621=0.7379
Symptoms No symptoms Total Positive 450 200 650 Negative 100 1250 1350 Total 550 1450 2000Related Questions
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