Answer to Question #350531 in Statistics and Probability for Raulz

Question

suppose there are four people to tested in covid 19. let P represent positive N represent negative and Z represent the number of infected persons that occur.Find the random variable Z

Answer 1

$$S=\{PPPP, PPPN, PPNP, PNPP, NPPP,$$

$$PPNN,PNPN, PNNP, NPNP, NPPN, NNPP,$$

$$PNNN, NPNN, NNPN, NNNP, NNNN\}$$

The possible values of random variable $Z$ are $0,1,2,3,4.$