Homework: Probability Question

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15% of the people in a population have been exposed to a new strain of the flu. We randomly sample three people from this population (assume these three people are independent).  Find the probability that: all, at least 1, and 2 were exposed.

Sep 15th, 2014

The probability of an event is the measure of the chance that the event will occur as a result of an experiment. The probability of an event A is the number of ways event A can occur divided by the total number of possible outcomes.

Probability of an event happening = Number of ways it can happen / Total number of outcomes

so now for the working

sample size = 3

probability that all are exposed= Number of ways it can happen / Total number of outcomes

probability that all are exposed= 3/3=1 ans


probability that 1 is exposed= Number of ways it can happen / Total number of outcomes

probability that all are exposed= 1/3= .33 or 33%ans


probability that 2 are exposed= Number of ways it can happen / Total number of outcomes

probability that all are exposed= 2/3= .66 or 66%ans


Sep 15th, 2014

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Sep 15th, 2014
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Sep 15th, 2014
Oct 23rd, 2017
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