A) Composite blood testing is sometimes used to save costs.A Hepatitis-C composite blood test means that when several blood samples are mixed together and tested for Hepatitis- C.The probability of testing positive for Hepatitis-C in a certain population is 0.171.If5 blood

samples are mixed together, what is the probability that composite sample would be positive (in other words, what is the probability that at least one of the people in the group is positive for Hepatitis-C)?

B) In a ten day period, the probability of a certain number of outbreaks of a contagious viral infection is represented in the table below.

Calculate P(1 x 3)

x P(x)

0 0.30

1 0.40

2 0.27

3 0.02

4 0.01