statistics hw

QUESTION 28 ***Calculate Kendall's tau for the following variables: X = c(5.4, 3.6, 8.7, 10.1, 8.5), Y = c(0.3, 0.4, 10, 20, 30) O a. 1 O b. 0.4 O C. 0.35 O d. 7 QUESTION 29 In the normal distribution, how many items fall in the range between u and u + 0.520? O a. 19.85% O b. 39.7% O C. 9.87% O d. 19.74% QUESTION 30 ***What is the weighted mean of three variates with value 7.2, five variates with value 6.5, and one variate with value 2.7: O a. 3.9 O b. 5.5 O C. 6.3 O d. 6.6