#4 and 5

show work please

1. Given the random set of four numbers, X1=1,2,3, and 5 , what's the value X2= ? ( 2 pts.) a. 25 b. 30 c. 39 d. 121 (3) None of the above 2. Given the random set of three numbers, Xi=2,3, and 4 , what's the value of (X+1)2= ? (3 pts. ) a. 8 b. 14 (4) 50 d. 64 e. None of the above (2+1)2+(3+1)2+(4+1)2=9+16+25=50 3.. Given the following two pairs of observations, What's the value of XY ? ( 3 pts.) X 1 22Y=4=8 36=18 4. Lee estimated the students' self-diagnostic test scores for the special quiz of OM class during this semester. What is the expected test score in the test results? ( 3 pts.) Testscore(x)Prob.P(x)102030400.2=20.3=60.3=90.2=8 a. 10 b. 20 c. 12.5 6. 25 e. None of the above 5. Given the following probability distribution of X, What's the value of (1) expected value (=) lpts. and (2) standard deviation (=)3pts..(4pt.) a. 2.3 and 1.005 b. 2.3 and 1.010 \&. 2.5 and 1.025 \&. 2.5 and 1.050 e. None of the above