To reduce costs, a medical lab will pool blood to conduct one single test for the prevalence of a relatively rare disease. Assume that 5 people had their blood drawn. One in ten (1 in 10 people have the disease) and the lab takes a portion of each person's blood and pools the blood together. Then the lab conducts one test of the pooled blood. If the test is negative, then the lab personnel can conclude that all 5 people are negative. If the pooled blood test is positive, then the lab personnel will have to go back to the original blood specimens and conduct a test on each one. Let the random variable, x, represent the number of tests conducted for each group of 5 people. What is E(X)?