xiamen university

posted by .

The probability that a person catches a cold during the cold and flu season is 0.62. Assume that 5 people are chosen at random.
A) What is the probability that exactly four of them will catch a cold?
B) What is the probability that three or more of them will catch a cold?
C) On average, how many of these five people would you expect to catch a cold?

  • xiamen university -

    prob of cold = .62
    prob of not cold = .38

    a) prob of 4 of 5 catch cold
    = C(5,4) (.62)^4 (.38)

    b) prob 3 or more
    = prob 3 + prob 4 + prob 5
    = C(5,3)(.62)^3 (.38)^2 + C(5,4) (.62)^4 (.38) + C(5,5) .62^5
    = ...

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. English

    1. It is not cold any more. 2. It is not cold any longer. 3. It is no more cold. 4. It is cold no more. 5. It is no longer cold. 6. It is cold no longer. Are all the sentences grammatical?
  2. spanish

    estar refriado it is cold or it will be cold the teacher will have these exactly as above and we must translate
  3. spanish sra mcguin

    estar refriado it is cold or it will be cold the teacher will have these exactly as above and we must translate
  4. English

    1. I feel being cold. 2. I feel cold. 3. I am cold. 4. I am being cold. I think #2 and #3 are correct. What about #1 and #4?
  5. English

    1. I made up my mind to go there. 2. I decided to go there. 3. I determined to go there. (They are all the same, right?
  6. history

    o What were Americans afraid of during the Cold War?
  7. English

    There are more than 200 different cold viruses. You can build up protection against a cold virus that you have already had. How ever, this 'immunity' can not help a person fight off a different cold virus. Immunity means: A. the spread …
  8. statistics

    Based on data from a statistical abstract, only about 12% of senior citizens (65 years old or older) get the flu each year. However, about 24% of the people under 65 years old get the flu each year. In the general population, there …
  9. Maths

    In a group of 60 people, 27 like cold drinks and 42 like hot drinks and each person likes at least one of the two drinks. What is the probability that a person chosen at random likes both coffee and tea?
  10. stats

    Based on data from a statistical abstract, only about 10% of senior citizens (65 years old or older) get the flu each year. However, about 27% of the people under 65 years old get the flu each year. In the general population, there …

More Similar Questions