If the prevalence of blindness in a population is 0.005, and prevalence of deafness is 0.001, the total prevalence of deafness and blindness together is:
0.000005
0.00005
0.006
None of the above
By the law of multiplication of probability, when two events are not mutually exclusive, the total probability is obtained by multiplying the individual probabilities. P(deafness and blindness)= P(deafness)x P(blindness)= 0.005x0.001=0.000005 Ref: Medical biostatistics, 1st edition pg: 191