Answer Happy

6 An un contains exactly three balls numbered 1, 2 and 3. respectively Random samples of two balls are drawn (first one followed by the second) from the urn with replacement. The averago, Xov -0.5*(X, X) where X, and X, are the numbers on the selected balls, is recorded after each drawing Which of the following describes the sampling distribution of Xv? 3 ut of question Xav 1 1.5 2 25 3 Probability 5/9 2/9 1/3 2/9 1 Xav 1 1.5 2 2.5 3 0 Probability 1/3 1/3 1/3 0 1 1.5 Xav 2 25 3 Probability 1/10 1/10 1/10 1/10 1/10 1 15 2 25 Xav شي 3 1/9 2/9 1/3 Probability 2/9 1/9
5 13 percent of internet sites referenced in scientific journals are lost within 2 years of publication if a paper contains seven internet references, the probability that all 7 are still good 2 years later is but of O 091 003773 O 0.87 O 0.13 question