# Suppose a test for a virus has a false-positive rate of 0.009 and a false-negative rate of 0.002. Assume that 1.5% of the population has the virus. (a) What is the chance someone from this population will test positive? (Enter exact answer.) (b) If someone tests positive, what is the chance he actually has the virus? (Answer correct to four decimal places.)

## Answers

Answer 1
Answer:

Answer:

(a) 0.023835

(b) 0.6281

Step-by-step explanation:

(a) The chance someone from this population will test positive is given by the percentage of people who have the virus multiplied by the change of testing positive (1 - false-negative rate) added to the percentage of people who do not have the virus multiplied by the change of testing positive (false-positive rate)

(b) The probability that someone actually has the virus given that they have tested positive is determined as the probability of having the virus and testing positive divided by the probability of testing positive:

## Related Questions

Is the work shown below correct? Explain your answer. (11 + 2i ) – (3 – 10i ) = 11 + 2i – 3 – 10i = (11 – 3) + (2i – 10i) = 8 – 8i

### Answers

Answer:

Incorrect

Step-by-step explanation:

We are given that

(11+2i)-(3-10i)

We have to find that work shown  in question is correct or not.

(11+2i)-(3-10i)

=11+2i-3+10i  (Using distributive property :)

=(11-3)+(2i+10i)

=8+12i

Hence, the work shown is wrong because in step 2 write -10i instead of 10i.

Answer :Incorrect

Answer:

No the work is incorrect, because the student changed the 10i to a -10i in step 2.

Step-by-step explanation:

Correct on edge 2022

What is the solution to the system of equations

### Answers

The solution is the set of numbers that can be written in place of
all the variables and make all of the equations true.

If you're asking for the actual numbers, there's nobody in the world
who could find those without seeing the system of equations.

What is the positive square root of 0.25

### Answers

The square root of 0.25 is 0.5
0.5×0.5=0.25
The negative square root is -0.5, but the positive is 0.5
So, your positive square root is 0.5.

Positive square root of 0.25 = 0.5

Hope this helps. - M

assume the probability of having a boy or a girl is the same. what is the probability of have a boy then a girl then another girl

### Answers

Answer:

Step-by-step explanation:

If the probability of having a boy or a girl is the same, then

the probability of having a boy = a probability of having a girl = 1/2.

Let B denote boy and G denote the girl.

The sample space of having three children is:

BBB, BBG, BGB, GBB, BGG, GBG, GGB, GGG.

The probabilities of each of those events is