# Answer on Statistics and Probability Question for vaibhav mishra

Question #39061

A disease is present in 22% of a population and is not present in the remaining

78%. An imperfect clinical test successfully detects the disease and with

probability 0.70. Thus if a person has the disease in the serious form, the

probability is 0.70 that the test will be positive and it is 0.30 if the test is negative.

Moreover among the unaffected persons, the probability that the test will be

positive is 0.05. (5)

(i) A person selected at random from the population is given the test and the

result is positive. What is the probability that the test will be positive is

0.05.

(ii) What is the probability that the test correctly detects cancer?

78%. An imperfect clinical test successfully detects the disease and with

probability 0.70. Thus if a person has the disease in the serious form, the

probability is 0.70 that the test will be positive and it is 0.30 if the test is negative.

Moreover among the unaffected persons, the probability that the test will be

positive is 0.05. (5)

(i) A person selected at random from the population is given the test and the

result is positive. What is the probability that the test will be positive is

0.05.

(ii) What is the probability that the test correctly detects cancer?

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