Posted by **agak** on Sunday, October 28, 2012 at 2:10pm.

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 -
**Reiny**, Sunday, October 28, 2012 at 5:32pm
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

= ...

## Answer This Question

## Related Questions

- statistics - Based on data from a statistical abstract, only about 12% of senior...
- Maths - In a group of 60 people, 27 like cold drinks and 42 like hot drinks and ...
- Statistic - Jake plays basketball. Assume y= the number of basketball goals that...
- Stat. - A national health organization predicts that 20% of American adults will...
- college math - biostatistics - hey... first time user and really lost. wondering...
- Probabilities - 1.) two marbles are drawn without replacement from a bowl ...
- Probabilities - 1.) two marbles are drawn without replacement from a bowl ...
- conditional probability - Among a group of people, 10% are from NYC and 90% are ...
- 12 math - there are 8 opposite sex married couples at a party. two people are ...
- Probability - Among a group of people, 10% are from NYC and 90% are not. All ...

More Related Questions